JPWO2020111275A1 - battery - Google Patents

Abstract

The battery 10 seals a cylinder 120 having an opening edge 110 at one end, a battery can having a bottom 130 closing the other end of the cylinder, an electrode body 200, and an opening at the opening edge. The sealing member includes a sealing member 300A, and the sealing member seals between the sealing plate 310, the cap 330A connected to the sealing plate 310 in an electrically insulated state, and the tubular portion 120 and the cap 330A. It has a stop and. The cap 330A has a ring-shaped top plate portion 331A facing the opening edge portion 110 in the axial direction of the tubular portion 120, and a side wall portion 332A covering the outer peripheral surface of the tubular portion 120. The sealing portion may be, for example, a gasket 340 interposed between the cap 330A and the cylinder portion 120 in a compressed state. The cap 330A is electrically connected to the tubular portion 120.

Description

The present invention relates to a battery.

As a method of closing the opening of the battery can after the electrode body is housed in the battery can, as shown in Patent Document 1, the vicinity of the opening of the battery case (battery can) is reduced in diameter to form an annular groove. , A method is known in which a gasket and a sealing plate are placed on an upper portion of a groove portion, and a caulking portion is formed by crimping the sealing plate through the gasket at the open end portion of the battery case.

Japanese Unexamined Patent Publication No. 7-105933

However, in the battery having the groove portion and the caulking portion, since the sealing member is placed on the groove portion and the caulking portion is formed on the sealing member via the gasket, the battery in the vicinity of the sealing plate is in the height direction of the battery. The dimensions tend to be large. Therefore, there is a limit to increasing the energy density as a battery.

One aspect of the present invention is a battery can having a cylinder having an opening edge at one end and a bottom having a bottom that closes the other end of the cylinder, and an electrode body housed in the cylinder. The sealing member includes a sealing member fixed to the cylinder portion so as to seal the opening of the opening edge portion, and the sealing member has a sealing plate and a through hole corresponding to the sealing plate, and the sealing plate. It has a cap connected to and electrically insulated from the cylinder, and a sealing portion for sealing between the cylinder and the cap, and the direction in which both ends of the cylinder face each other is axial. As a result, the cap has a ring-shaped top plate portion that faces the opening edge portion in the axial direction of the tubular portion and is arranged along the peripheral edge of the sealing plate, and the bottom portion from the outer peripheral edge of the top plate portion. The battery can is electrically connected to one of the electrodes of the electrode body, and the sealing plate is the electrode body. The cap relates to a battery, which is electrically connected to the other electrode of the battery and is electrically connected to the cylinder portion.

According to the present invention, the height of the battery can be easily reduced, and a battery having a high energy density can be easily realized.
Although the novel features of the present invention are described in the appended claims, the present invention is further described in the following detailed description with reference to the drawings, in combination with other objects and features of the present invention, both in terms of structure and content. It will be well understood.

It is a vertical cross-sectional schematic diagram which shows one Embodiment of the battery which concerns on 1st Embodiment of this disclosure. It is a perspective view which shows the appearance of the battery can in the said battery. FIG. 5 is an enlarged vertical cross-sectional schematic view of a main part of the battery shown in FIG. FIG. 5 is a schematic vertical cross-sectional view showing a modified example of the battery shown in FIG. 1 with an enlarged main part. FIG. 5 is a schematic vertical cross-sectional view showing a modified example of the battery shown in FIG. 1 with an enlarged main part. It is sectional drawing which shows the sealing process of the battery shown in FIG. It is sectional drawing which shows the sealing process of the battery shown in FIG. It is sectional drawing which shows the sealing process of the battery shown in FIG. FIG. 5 is an enlarged vertical cross-sectional schematic view of a main part of a battery showing an embodiment of the battery according to the first aspect of the present disclosure. FIG. 5 is an enlarged vertical cross-sectional schematic view of a main part of a battery showing an embodiment of the battery according to the first aspect of the present disclosure. FIG. 5 is an enlarged vertical cross-sectional schematic view of a main part of a battery showing an embodiment of the battery according to the first aspect of the present disclosure. 9 is a schematic vertical cross-sectional view showing a modified example of the battery shown in FIG. 9, which is an enlarged view of a main part of the battery. It is a vertical cross-sectional schematic diagram which shows one Embodiment of the battery which concerns on 1st Embodiment of this disclosure. It is a schematic vertical sectional view of the opening edge side which shows one Embodiment of the battery which concerns on the 2nd aspect of this disclosure. It is a perspective view which shows the appearance of the battery shown in FIG. It is an enlarged view of the region III of FIG. 12 is a schematic vertical cross-sectional view of the opening edge side of the battery of FIG. 12 before the opening of the battery can is sealed with the sealing member. FIG. 15A is a schematic vertical cross-sectional view of the opening edge side showing a state in which the sealing member of FIG. 15A is inserted into the opening of the battery can. FIG. 15B is a schematic vertical cross-sectional view of the opening edge side showing a state in which the opening edge portion of the battery can and the opening side end portion of the side wall portion of the cap of the sealing member are bent. It is an enlarged view of the region VA of FIG. 15A. It is an enlarged view of the area VB of FIG. 15B. It is an enlarged view of the region VC of FIG. 15C. It is a vertical cross-sectional schematic diagram which shows one Embodiment of the battery which concerns on the 3rd aspect of this disclosure. It is a perspective view which shows the appearance of the battery can in the said battery. FIG. 6 is an enlarged vertical cross-sectional schematic view of a main part of the battery shown in FIG. FIG. 6 is a schematic vertical cross-sectional view of a main part showing another aspect of the battery shown in FIG. FIG. 5 is a schematic vertical cross-sectional view showing an embodiment of a battery according to a third aspect of the present disclosure, in which a main part is enlarged. It is a vertical cross-sectional schematic diagram which shows one Embodiment of the battery which concerns on the 4th aspect of this disclosure. It is a perspective view which shows the appearance of the battery. FIG. 2 is an enlarged vertical cross-sectional schematic view of a main part of the battery shown in FIG. 22. FIG. 5 is a schematic vertical cross-sectional view showing an embodiment of a battery according to a fourth aspect of the present disclosure, in which a main part is enlarged. It is a vertical cross-sectional schematic diagram which shows one Embodiment of the battery which concerns on the 4th aspect of this disclosure. It is a vertical cross-sectional schematic diagram which shows one Embodiment of the battery which concerns on the 4th aspect of this disclosure.

The battery according to the present disclosure includes a cylinder having an opening edge at one end, a battery can having a bottom that closes the other end of the cylinder, an electrode body housed in the cylinder, and an opening edge. A sealing member fixed to the tubular portion so as to seal the opening of the portion is provided. The sealing member is a sealing portion that seals between the sealing plate, a cap that has a through hole corresponding to the sealing plate and is electrically insulated from the sealing plate, and a cylinder portion and the cap. And have. The cap has a ring-shaped top plate that faces the opening edge in the axial direction of the cylinder and is arranged along the peripheral edge of the sealing plate, and extends from the outer peripheral edge of the top plate toward the bottom to form a cylinder. It has a side wall portion that covers the outer peripheral surface of the portion.

Here, the direction in which both ends of the tubular portion face each other is defined as the axial direction. Also, for convenience, the direction from the sealing plate to the electrode body (or the direction from the sealing plate to the bottom of the battery can) is downward, and the direction from the electrode body to the sealing plate (or from the bottom of the battery can to the sealing plate). Direction) is the upward direction. However, in the battery of the present invention, it is not essential that the sealing plate is above the electrode body. The sealing plate may be below the electrode body and the bottom may be above the electrode body. Generally, when the battery can is erected with the bottom facing down, the axial direction of the cylinder portion from the bottom to the opening edge is upward. However, the upward and downward directions do not have to be parallel to the axial direction of the tubular portion, and may be any direction along the axial direction. The direction from the electrode body to the sealing plate may also be referred to as a height direction. The direction perpendicular to the axial direction may be referred to as a radial direction or a lateral direction.

Further, the opening edge portion is a portion of the cylinder portion of the battery can on the opening side and a portion in the vicinity thereof, and is a portion of the cylinder portion that can face the sealing member of the cylinder portion from the end portion on the bottom side to the opening side. The part up to the end of.

According to the battery of the present disclosure, it is not necessary to provide an annular groove and a caulking portion formed in the opening edge portion for mounting the conventional sealing plate. Therefore, the height of the battery can be reduced and the energy density of the battery can be increased.

Further, the top plate portion of the cap has a ring shape having a substantially flat surface, and is electrically insulated from the sealing plate. The battery can is electrically connected to one electrode of the electrode body, and the sealing plate is electrically connected to the other electrode of the electrode body. At this time, by electrically connecting the side wall portion of the cap to the cylinder portion of the battery can, the voltage of the external terminal connected to the battery can can be taken out from the top plate portion.

In a normal battery, the sealing plate functions as an external terminal of one electrode (for example, positive electrode) of the battery, and the battery can functions as an external terminal of the other electrode (for example, negative electrode). When an external lead wire is connected to each external terminal, one external lead wire is led out from the upper surface of the battery, and the other external lead wire is led out from the lower surface of the battery. In this case, a space for wiring is required in the vertical direction of the battery.

On the other hand, in the battery of the present disclosure, the cap can function as an external terminal of the other electrode connected to the battery can. Therefore, both electrodes can collect current from the upper side (sealing plate side) of the battery. Therefore, the space (wiring space) for wiring the leads connected to each external terminal may exist on the sealing plate side, and the wiring space can be saved.

Further, as the top plate portion of the cap, a conductive member processed into a flat ring can be used before assembling the battery. Therefore, by adjusting the through hole of the top plate portion to be small, the ratio of occupying the area of the flat portion of the top plate portion can be increased. Therefore, the connection between the cap and the external lead wire to be connected becomes easy. On the other hand, in a conventional battery having a crimped portion, if the crimped portion is extended from the outer periphery of the battery toward the central axis during the sealing process, the change in the peripheral length becomes large and wrinkles are likely to be formed in the crimped portion. Therefore, it is difficult to ensure the flatness of the crimped portion. Compared to this conventional battery, the battery of the present disclosure having a top plate portion has a significantly improved degree of freedom in connecting external lead wires.

The batteries of the present disclosure can be configured, for example, in the first to fourth aspects described below.
In a non-limiting first aspect, the sealing portion has a first gasket. The first gasket is interposed between the cap and the cylinder portion in a compressed state. As a result, the space between the opening edge of the battery can and the sealing member is sealed.

The side wall portion has, for example, a first locking portion that is locked to the tubular portion. The side wall portion may extend via the tubular portion so as to overlap the electrode body, and the first locking portion may face the electrode body via the tubular portion.

The space between the cap and the opening edge (cylinder) and the space between the cap and the sealing plate are sealed by, for example, a gasket. The sealing between the cap and the opening edge and the sealing between the cap and the sealing plate may be performed using the same gasket (first gasket), or the cap and the opening edge may be sealed. The sealing between the cap and the sealing plate may be performed by using the first gasket, and the sealing between the cap and the sealing plate may be performed by using the second gasket. The second gasket may intervene in a compressed state between the sealing plate and the cap. When a second gasket is used, the second gasket may be provided at a distance from the first gasket. The first gasket does not have to be a molded product as long as it can be sealed. The first gasket may be placed on the surface of one of the cap and cylinder members and supported by the other member. Similarly, the second gasket does not need to be a molded product as long as it can insulate and seal between the sealing plate and the cap. When the sealing between the cap and the opening edge and the sealing plate is performed only by the first gasket, the sealing between the cap and the sealing plate is, for example, the first gasket with the outer peripheral edge of the sealing plate. It can be done by interposing it between the top plate and the top plate. Alternatively, instead of the second gasket, an insulating agent is applied to the contact portion between the sealing plate and the cap, or the surface of one of the two members is insulated to provide a space between the sealing plate and the cap. Insulation and sealing may be performed.

When the second gasket is used, the first gasket and the second gasket may be arranged apart from each other so as to have a gap between the first gasket and the second gasket. Having a gap between the first gasket and the second gasket includes, for example, a case where the first gasket and the second gasket face each other through the gap. In this case, in the configuration in which the gap is interposed between the first gasket and the second gasket, the space in the height direction of the battery sealing mechanism can be easily reduced.

In order to form the first locking portion, when the side wall portion of the cap is crimped in the lateral direction perpendicular to the axial direction to seal between the cap and the opening edge portion, the lateral force is the second gasket. It is transmitted to the sealing plate via the above, and the sealing plate may be deformed. However, by providing a gap between the first gasket and the second gasket, it is possible to prevent the lateral force from being directly transmitted to the sealing plate. Therefore, the deformation of the sealing plate can be suppressed.

The cap may have a support portion that is erected on a surface of the top plate portion that faces the bottom portion and extends axially toward the bottom portion. The support portion is provided, for example, to fix the second gasket in a compressed state and to seal between the cap and the sealing plate. In this case, the second gasket may be interposed between the inner peripheral surface of the support portion and at least the outer peripheral edge portion of the sealing plate. On the other hand, the first gasket may be located on the outer peripheral side of the support portion and may be provided in the outer peripheral region including the outer peripheral end portion of the top plate portion.

The support portion may extend axially toward the bottom and then further bend along the peripheral edge of the second gasket to extend inward in the radial direction (lateral direction). As a result, the support portion can grip the peripheral edge of the second gasket together with the top plate portion and compress the second gasket in the axial direction to improve the sealing property between the cap and the sealing plate. When the sealing plate is supported above the cap, the supporting portion may be erected on the upper surface of the top plate portion. The support portion may be an annular shape extending in the circumferential direction and having no defects, and may be formed intermittently in the circumferential direction as long as it can be sealed. Further, the support portion may be integrated with the top plate portion, or a support portion formed separately from the support portion may be connected to the top plate portion. When the support portion and the top plate portion are integrally formed, for example, on the support portion forming surface of the top plate portion, the circumference of the support portion formation planned portion may be forged to make the support portion formation planned portion uneven. good.

The first locking portion can be locked by a second locking portion provided on the opening edge. The second locking portion has, for example, a first surface which is an inner peripheral surface of the tubular portion and a second surface which extends from the first surface and faces the top plate portion. The second locking portion may be formed on the outer peripheral surface of the accommodating portion of the tubular portion instead of the opening edge portion.

When the first gasket covers at least a part of the first surface, at least a part of the first gasket covering the first surface can be compressed in a direction perpendicular to the axial direction (lateral direction). As a result, the space between the side wall portion of the cap and the opening edge portion can be sealed. The first surface, which is the inner peripheral surface of the tubular portion, is not limited to the case where the first surface is oriented exactly perpendicular to the axial direction, and may be inclined from the axial direction. If the normal vector of the first surface has a lateral component, the first gasket covering the first surface can be compressed laterally to seal between the side wall and the open edge. ..

Similarly, if the first gasket covers at least a portion of the second surface, then at least a portion of the first gasket covering the second surface can be axially compressed. As a result, the space between the side wall portion of the cap and the opening edge portion can be sealed. The second surface is not limited to the case where it faces a direction exactly parallel to the axial direction, and may be inclined from the axial direction. If the normal vector of the second surface has an axial component, the first gasket covering the second surface can be axially compressed and sealed between the side wall and the open edge. .. The second surface may include the end face of the opening edge.

A first gasket may be interposed between the tubular portion and the side wall portion. In that case, the second locking portion locks the first locking portion via the first gasket interposed between the tubular portion and the side wall portion. The first gasket is in contact with the inner peripheral surface and the outer peripheral surface of the tubular portion. Thereby, the airtightness between the side wall portion and the opening edge portion can be enhanced. On the other hand, the tubular portion and the side wall portion can be electrically connected below the portion interposed between the tubular portion and the side wall portion of the first gasket. When sealing is performed between the side wall portion and the cylinder portion via the first gasket, a part of the first gasket is interposed between the top plate portion and the cylinder portion or between the support portion and the cylinder portion. You don't have to.

As one aspect of the second locking portion, for example, a protruding portion that protrudes toward the outside of the tubular portion in the lateral direction (diameter direction) and / or may be provided on the outer side of the tubular portion that is bent or curved. .. The protruding portion can be realized by increasing the thickness of the end portion of the opening edge portion so as to project toward the outer peripheral side, or by bending the opening edge portion outward. The first gasket may intervene in a compressed state between at least a part of the protrusion and the cap.

Similar to the second locking portion, the first locking portion may be provided with a protruding portion that projects toward the inside of the tubular portion and / or bends or bends inside the tubular portion. The protruding portion can be realized by increasing the thickness of the end portion of the side wall portion so as to project toward the inner peripheral side, or by bending the side wall portion inward. At this time, the protrusions of the first locking portion and the protrusions of the second locking portion are arranged so that the protrusions of the first locking portion are located below the protrusions of the second locking portion (on the electrode body side). It may face the portion. In this case, by forming a hook between the protruding portions, the cap can be locked to the opening edge portion against the repulsive force of the compressed first gasket. Thereby, the airtightness between the side wall portion and the opening edge portion can be enhanced. Further, even when the internal pressure of the battery rises, the sealing between the side wall portion and the opening edge portion can be maintained.

The first locking portion abuts on the second locking portion at least in at least a part of the protruding portion of the first locking portion facing the protruding portion of the second locking portion, without passing through the first gasket. It is preferable to have. As a result, the first locking portion and the second locking portion are electrically connected, and the cap and the cylinder portion of the battery can can be electrically connected via the contact portion.

When the first gasket is compressed and the repulsive force of the first gasket is used to seal between the opening edge and the cap, the thicker the first gasket in the compression direction, the more the first The repulsive force of the gasket is reduced, and it becomes difficult to improve the airtightness between the side wall portion and the opening edge portion. Therefore, in order to increase the repulsive force of the first gasket and enhance the airtightness between the side wall portion and the opening edge portion, an annular support wall erected on the surface facing the bottom portion of the top plate portion is capped. It may be provided in. The outer peripheral surface of the support wall comes into contact with the inner peripheral surface of the first gasket. The support wall may be formed in an annular shape along the contour shape of the opening edge portion, but may be formed upright from the top plate portion intermittently along the circumferential direction. The support wall can also be used to ensure a gap between the first gasket and the second gasket.

When the second locking portion has a protrusion that is bent or curved and extends toward the outside of the tubular portion, and the first locking portion is locked by the protrusion (via the first gasket). , The thickness of the first gasket (or the thickness between the inner surface of the cap and the surface of the opening edge) in the compression direction changes in the protrusion, and the repulsive force of the first gasket tends to be non-uniform. Regardless of the location of the curved portion, the outer peripheral surface of the support wall may be inclined along the curved portion of the second locking portion in order to obtain a high repulsive force of the gasket. As a result, a high repulsive force of the gasket can be obtained regardless of the location in the curved portion, and the airtightness between the side wall portion and the opening edge portion can be enhanced. In other words, the region where the sealing stress is high can be widened at the interface between the first gasket and the cylinder or the interface between the first gasket and the cap. Therefore, it is possible to more reliably prevent the invasion of outside air and moisture that try to invade through this region.

In a second, non-limiting aspect, the sealing portion has a sealing agent disposed between the sealing member and the opening edge. The sealant is arranged in a part between the side wall portion and the opening edge portion, and seals between the side wall portion and the opening edge portion.

The sealing member is composed of a cap and a sealing plate, and the side wall of the cap and the opening edge of the cylinder of the battery can are sealed with a sealing agent to form a circle at the opening edge as in the conventional case. The airtightness of the battery can be ensured without forming an annular groove. Further, since the cap and the sealing plate are insulated, it is not necessary to dispose an insulating gasket (also called an outer gasket) between the cap and the opening edge. Since there is no groove (and outer gasket) in this way, the proportion of the sealing mechanism such as the sealing member in the volume of the upper part of the electrode body (more specifically, in the vertical direction (or height direction) of the battery) as compared with the conventional battery. ) Can be reduced. Therefore, it is possible to reduce the height of the upper part of the electrode body. Further, since the volume occupied by the electrode body can be increased, the capacitance density can be increased.

The side wall portion of the cap may be bent inward in the radial direction of the tubular portion together with the opening edge portion. Since the airtightness can be further improved by this bending, high pressure resistance of the battery can be ensured. In addition, the reliability of the electrical connection between the side wall portion and the opening edge portion can be improved.

The top plate portion of the cap may be provided with a recess for accommodating the peripheral edge of the sealing plate. An insulating gasket may be placed between the recess and the sealing plate. As a result, the sealing plate can be stably held by the cap while the sealing plate and the cap are insulated from each other. By having the cap hold the sealing plate, the volume of the sealing member can be further reduced. For example, an insulating third gasket may be arranged between the recess and the sealing plate.

The top plate portion of the cap may include a support portion that is erected inward from the side wall portion and is bent inward in the radial direction of the tubular portion. By bending the support portion, the recessed portion of the top plate portion may be formed. In this case, the sealing plate can be stably held by the concave portion in which the support portion is bent.

The tubular portion may include a step portion formed at the bottom end side of the opening edge portion inside the tubular portion. The step portion is formed by making the thickness of the opening edge portion of the tubular portion smaller than the remaining portion (thickness of the portion other than the opening edge portion of the tubular portion). The cap is placed on the step. It is preferable that the sealant is further arranged between the step portion and the cap. When the sealing member is inserted through the opening of the tubular portion, the stepped portion restricts the insertion of the sealing member in the downward direction, which facilitates the positioning of the sealing member. Further, the stepped portion stably holds the sealing member at the opening edge portion of the tubular portion. Since the sealing agent is arranged between the step portion and the cap, airtightness can be ensured even when the step portion is formed.

In a non-limiting third aspect, the sealing member has a fourth gasket that seals between the inner peripheral surface of the tube and the sealing plate. A sealing portion is provided on a part of the side wall portion, and the sealing portion presses the tubular portion and the fourth gasket in the direction from the outer peripheral surface side to the inner peripheral surface side of the side wall portion. As a result, the sealing portion electrically connects the side wall portion and the battery can, and the fourth gasket is interposed between the sealing plate and the inner peripheral surface of the cylinder portion in a compressed state. ing.

The fourth gasket seals between the opening edge of the battery can and the sealing plate. For sealing between the opening edge and the sealing plate, for example, the inner peripheral surface of the cylinder of the battery can is overlapped with the side surface of the gasket, and the outer peripheral surface of the cylinder is overlapped with the side wall of the cap. This can be done by pressing the opening edge portion and the gasket laterally toward the inner peripheral surface side (direction toward the axis of the tubular portion) via the portion. By pressing, the gasket is compressed in the radial direction of the opening between the side wall of the cap and the sealing plate, and the repulsive force of the gasket ensures the sealing between the sealing member and the inner peripheral surface of the cylinder, and the sealing member. Is fixed to the battery can. The portion of the gasket may be present in a compressed state at least in the vicinity of the pressing portion (that is, the sealing portion) of the side wall portion between the sealing plate and the inner peripheral surface of the tubular portion.

A groove having a small inner diameter (hereinafter, also referred to as a “diameter-reduced portion”) may or may not be provided in the cylinder portion in the vicinity of the opening edge portion. In the present embodiment, in order to compress the gasket through the side wall portion of the cap to seal between the inner peripheral surface of the tubular portion and the sealing plate, a reduced diameter portion is provided in the vicinity of the opening edge portion of the tubular portion. There is no need to provide it. Therefore, when the diameter-reduced portion is not provided, the size of the electrode body is not limited by the diameter-reduced portion, so that a high-capacity battery can be easily realized. On the other hand, by providing the reduced diameter portion, the positioning of the gasket in the tubular portion becomes easy. When the reduced diameter portion is not provided, it is preferable to position the gasket with respect to the tubular portion by providing the gasket with an engaging portion that protrudes to the outer peripheral side and is engaged with the opening edge portion.

The outer peripheral surface of the tubular portion on the opening edge side is overlapped with the inner peripheral surface of the side wall portion of the cap. At this time, it is preferable that a protrusion protruding inward is provided on the inner peripheral surface side of the side wall portion. By pressing the side wall along the protrusion, the cylinder is pressed by the protrusion, and the gasket is compressed in the direction from the outer peripheral surface side to the inner peripheral surface side of the side wall through the pressing portion of the cylinder. obtain. The protrusion can be formed by reducing the diameter of the cylinder inward. A plurality of protrusions may be formed intermittently along the circumferential direction of the opening, or may be continuously formed along the circumferential direction of the opening.

In the cap, for example, the inner surface of the top plate portion facing the electrode body abuts on the fourth gasket to seal between the sealing plate and the top plate portion. However, the opening edge portion does not have to be in contact with the inner surface of the top plate portion. It is preferable that the end surface (opening edge) of the tubular portion faces the inner surface of the top plate portion via a fourth gasket and / or a gap. As a result, it becomes easy to secure the flatness of the top plate portion, and it becomes easy to connect the external lead wire to the top plate portion. When the above-mentioned engaging portion is provided, the end surface (opening edge) of the tubular portion is covered with a fourth gasket. In that case, a gap may or may not be interposed between the fourth gasket covering the opening edge and the top plate portion.

The tubular portion may have a support portion that projects toward the inner peripheral surface side of the tubular portion and supports the electrode body side of the fourth gasket. The support portion is provided to position the fourth gasket on the tubular portion. The support portion may be formed by thickening a partial region of the tubular portion, or may be formed by reducing the diameter of the tubular portion. The support portion may or may not be used for sealing the sealing plate. Although it depends on the protruding length of the support portion, by sandwiching the fourth gasket between the support portion and the top plate portion of the cap, the fourth gasket can be compressed in the axial direction and the airtightness can be improved. However, when the support portion is not used for sealing the sealing plate, the protruding length of the support portion may be shorter than that of the conventional groove portion (diameter-reduced portion). The protruding length of the support portion may be a length capable of positioning the fourth gasket, for example, 0.005 times or more of the maximum inner diameter at the opening edge.

In a fourth aspect, which is not limiting, the sealing portion has a fifth gasket that seals between the opening edge and the cap. The fifth gasket is interposed between the opening edge portion and the top plate portion, and the opening edge portion is axially pressed by the fifth gasket. That is, the fifth gasket between the top plate portion and the opening edge portion is compressed at least in the axial direction, whereby the space between the opening edge portion and the sealing plate of the battery can is sealed. In this case, since it is not necessary to provide a conventional annular groove (also referred to as a reduced diameter portion), the electrode body is arranged closer to the sealing plate, or the height of the electrode body is increased to a position closer to the sealing body. Is possible. Therefore, the energy density of the battery can be increased.

The space between the cap and the opening edge and the space between the cap and the sealing plate are sealed by, for example, a gasket. The sealing between the cap and the opening edge and the sealing between the cap and the sealing plate may be performed using the same gasket (fifth gasket), or the cap and the opening edge may be sealed. The sealing between the cap and the sealing plate may be performed by using a fifth gasket, and the sealing between the cap and the sealing plate may be performed by using another gasket (sixth gasket). When using the sixth gasket, the sixth gasket may be provided apart from the fifth gasket. When the sealing between the cap and the opening edge and the sealing plate is performed only by the fifth gasket, the sealing between the cap and the sealing plate is, for example, the fifth gasket with the outer peripheral edge of the sealing plate. It can be done by interposing it between the top plate and the top plate.

The cap may have a support portion extending in the axial direction toward the bottom portion on the inner peripheral side from the position where the peripheral wall portion of the top plate portion is formed. The support portion is provided, for example, to fix the sixth gasket in a compressed state and to seal between the cap and the sealing plate. In this case, the sixth gasket may be interposed between the inner peripheral surface of the support portion and at least the outer peripheral edge portion of the sealing plate. On the other hand, the fifth gasket may be located on the outer peripheral side of the support portion and may be provided in the outer peripheral region including the outer peripheral end portion of the top plate portion.

In order to improve the sealing performance between the cap and the sealing plate, the support portion extends axially toward the bottom and then bends and extends inward along the peripheral edge of the sixth gasket. May be good.

In these embodiments, the tubular portion and the side wall portion may be cylindrical or square tubular, respectively. When the tubular portion is cylindrical, the side wall portion of the cap is cylindrical, and the inner peripheral surface of the side wall portion is overlapped with the outer peripheral surface of the tubular portion on the opening edge side. At this time, the cap and the tubular portion can be electrically connected in at least a part of the tubular portion region (overlapping region) that overlaps with the inner peripheral surface of the side wall portion.

The overlapping region may be reduced in diameter. That is, the outer diameter of the tubular portion in the overlapping region may be formed to be smaller than the outer diameter of the tubular portion excluding the overlapping region. The inner diameter of the side wall portion of the cap may be equal to or less than the maximum value of the outer diameter of the tubular portion. Thereby, the outer diameter of the side wall portion of the cap can be made to be substantially the same as or less than the outer diameter on the bottom side of the tubular portion, and the change in the diameter of the battery in the axial direction can be reduced.
Here, the inner diameter (outer diameter) of the tubular portion and / or the side wall portion is circumscribed with the contour shape of the inner circumference (outer circumference) of the tubular portion and / or the side wall portion when the tubular portion and / or the side wall portion is not cylindrical. The diameter of the smallest circle.
The inner peripheral surface of the side wall is overlapped with the outer peripheral surface of the tubular portion on the opening edge side only when the inner peripheral surface of the side wall is in direct contact with the outer peripheral surface of the tubular portion on the opening edge side. No. In a part of the overlapping region, the inner peripheral surface of the side wall portion may face the outer peripheral surface of the tubular portion on the opening edge side via a gap, or may face each other via a gasket or the like.

The inner peripheral surface of the side wall portion of the cap may be joined to the outer peripheral surface of the tubular portion. The joint may be formed in at least a part of the overlapping region. The joint can be formed, for example, by welding. By welding, the cap is firmly fixed to the battery can, and the resistance is lowered to improve the current collecting property. The welding method is not particularly limited, and may be appropriately selected depending on the material of the cap and the battery can. Examples of the welding method include laser welding, resistance welding, friction stir welding, brazing, and the like.

The sealing method between the cap and the sealing plate in the sealing member is not particularly limited. For example, the sealing plate may be connected to the top plate portion of the cap in an insulated state. The sealing plate may be connected to the lower surface of the top plate (the surface facing the bottom) via a gasket, or may be connected to the upper surface of the top plate (the surface not facing the bottom) via the gasket. May be good. Further, the sealing plate may be arranged inside the through hole formed by the top plate portion on the ring. However, from the viewpoint of lowering the height, it is preferable that the lower surface facing the bottom of the sealing plate is not located above the upper surface of the top plate.

The sealing plate and the gasket (second, third, fourth, fifth or sixth gasket) used for sealing between the cap and the sealing plate may be joined to each other. For example, by integrally molding the sealing plate and the gasket, a sealing body in which the sealing plate and the gasket are joined to each other can be obtained. Insert molding can be used as the method of integral molding. In this case, the shapes of the sealing plate and the gasket are not limited, and any shape can be designed. Further, since the sealing plate and the gasket are integrally molded, the sealing plate and the gasket can be handled as one part, and the battery can be easily manufactured.

By attaching and fixing such a sealing body to the cap, a sealing member in which the space between the cap and the sealing plate is sealed can be obtained. The sealing member in this state can also be handled as one part. After that, by attaching the sealing member to the battery can and sealing between the cylinder portion and the cap, the upper current can be collected, and a battery having a high energy density can be easily manufactured.

The gaskets (second to sixth gaskets) that seal between the cap and the sealing plate are, for example, an inner ring portion arranged on the electrode body side (inside) of the peripheral portion of the sealing plate and a peripheral portion of the sealing plate. It has an outer ring portion arranged on the opposite side (outside) of the electrode body, and a relay ring portion that covers the end surface of the peripheral edge portion of the sealing plate. The shapes of the inner ring portion, the outer ring portion, and the relay ring portion are not limited, and any shape can be designed. For example, the shape of the inner peripheral contour of the outer ring portion can be designed to have arbitrary rotational symmetry and / or plane symmetry such as a regular polygon or a wavy curve in addition to a circle, and an external lead or the like. It can be designed into a shape that has a fitting function with other parts. Further, it is also easy to provide an opening or unevenness in which the sealing plate is exposed at a specific position of the outer ring portion or the inner ring portion, or to thicken a predetermined position of the outer ring portion.

Hereinafter, the battery according to each aspect of the present disclosure will be specifically described with reference to the drawings, but the present invention is not limited thereto.

[First aspect]
The battery according to the first aspect of the present disclosure includes a battery can having a cylinder having an opening edge at one end and a bottom having a bottom that closes the other end of the cylinder, and an electrode housed in the cylinder. It includes a body and a sealing member fixed to a cylinder portion so as to seal the opening of the opening edge portion. The sealing member has a sealing plate, a through hole corresponding to the sealing plate, and a cap connected to the sealing plate in a state of being electrically insulated from the sealing plate, and seals between the tubular portion and the cap. It has a first gasket and the like. With the direction in which both ends of the tubular portion face each other as the axial direction, the cap faces the opening edge portion in the axial direction and has a ring-shaped top plate portion arranged along the peripheral edge of the sealing plate and a top plate portion. It has a side wall portion extending from the peripheral edge toward the bottom portion and covering the outer peripheral surface of the tubular portion. The side wall portion may have a first locking portion that is locked to the tubular portion. The first gasket is interposed between the cap and the cylinder portion in a compressed state. The battery can is electrically connected to one electrode of the electrode body, the sealing plate is electrically connected to the other electrode of the electrode body, and the cap is electrically connected to the tubular portion.

(First Embodiment)
FIG. 1 is a schematic vertical cross-sectional view showing an embodiment of the battery according to the first aspect of the present disclosure, and FIG. 2 is a perspective view of the battery. FIG. 3 is a schematic vertical cross-sectional view of the battery 10 of FIG. 1 in which the vicinity of the opening edge 110 is enlarged. In addition, in FIGS. 1 to 3, the state in the vicinity of the cylinder portion of the battery, particularly the opening edge portion 110, is emphasized. Further, the description of the upper insulating plate arranged on the electrode body 200 is omitted. The dimensional ratio between each element of the constituent members such as the sealing plate 310, the cap 330A, the gasket 340, and 350 may not match the actual dimensional ratio. This also applies to the subsequent drawings.

The battery 10 is cylindrical and includes a cylindrical bottomed battery can 100, a cylindrical electrode body 200 housed in the can, and a sealing member 300A for sealing the opening of the battery can 100.

The battery can 100 has a tubular portion 120 for accommodating the electrode body 200 and a bottom portion 130. The tubular portion 120 has an opening edge 110 at one end thereof, and the other end is closed by the bottom 130. The tubular portion 120 includes an opening edge portion 110 and a housing portion 150 for accommodating the electrode body. The opening of the opening edge 110 is closed by the sealing member 300A.

The sealing member 300A has a sealing plate 310, a cap 330A, a first gasket 340, and a second gasket 350.

The sealing plate 310 may have a disk shape and may have an explosion-proof function. Specifically, the sealing plate 310 includes a thick peripheral portion 311 and a central region 312 for ensuring mechanical strength, and a thin-walled portion 313 that exerts an explosion-proof function. The thin-walled portion 313 is provided in the region between the peripheral portion 311 and the central region 312. An end of a lead wire 210 led out from a positive electrode or a negative electrode constituting the electrode body 200 is connected to the inner surface of the central region 312. Therefore, the sealing plate 310 has one terminal function.

When the internal pressure of the battery can 100 rises, the sealing plate 310 rises outward, and for example, stress due to tension concentrates on the boundary portion between the peripheral edge portion 311 and the thin-walled portion 313, and breakage occurs from the boundary portion. As a result, the internal pressure of the battery can 100 is released, and the safety of the battery 10 is ensured.

The cap 330A has a ring-shaped top plate portion 331A arranged along the peripheral edge of the sealing plate 310, and a cylindrical side wall portion 332A. The cap 330A is electrically insulated from the sealing plate 310 by a second gasket 350. The side wall portion 332A extends while bending from the outer peripheral edge of the top plate portion 331A toward the bottom portion 130, and covers the outer peripheral surface of the opening edge portion 110 directly or via the first gasket 340. A portion of the side wall portion 332A that extends while bending inward constitutes a first locking portion 401. Such a bent side wall portion 332A can be produced by undergoing a process of crimping the side wall portion 332A inward in a direction (lateral direction) perpendicular to the axial direction of the tubular portion. The first locking portion 401 may be formed in advance before sealing.

The cap 330A is conductive and has the same polarity as the battery can 100. Therefore, the cap 330A can be provided with the other terminal function having a polarity different from that of the sealing plate 310. Therefore, both electrodes of the battery 10 can be collected from the upper surface of the sealing member 300A. For example, the first external lead wire 501 can be connected to the top plate portion 331A of the cap 330A, and the second external lead wire 502 can be connected to the outer surface of the central region 312 of the sealing plate 310.

The cap 330A further has a support portion 334A and a support wall 335A.

The support portion 334A is erected from a position on the inner peripheral side of the top plate portion 331A from the position where the side wall portion 332A is formed, and extends axially toward the bottom portion 130. The support portion 334A fixes the second gasket 350 to the cap 330A in a state where the space between the cap 330A and the opening edge 110 is sealed. The contour line of the support portion 334A when viewed from the top plate portion 331A in the axial direction may have a shape similar to the outer edge of the second gasket 350. For example, when the battery is a cylindrical battery and the outer edge shape of the second gasket seen from the axial direction is a circle, the contour line of the support portion 334A is also a circle. However, the contour line does not necessarily have to be a closed curve, and a region in which the support portion 334A is not provided may be provided in a part in the circumferential direction.

In the present embodiment, the support portion 334A extends axially toward the bottom portion 130, then further bends along the peripheral edge of the second gasket, and extends inward toward the central region 312 of the sealing plate 310. ing. Thereby, the sealing property between the cap 330 and the sealing plate 310 can be further improved. The bent portion of the support portion 334A can be formed by crimping a part of the upright support portion 334A to the inner peripheral side and bending the support portion 334A. The bent portion does not have to be formed on the entire circumference of the support portion 334A, and may be formed intermittently along the circumferential direction.

The support wall 335A is provided with a gap C between the first gasket 340 and the second gasket 350, and the first surface S1 and the support wall 335A, which are the inner peripheral surfaces of the tubular portion, will be described later. It is provided to adjust the thickness of the gasket 340.

As described above, when the first locking portion 401 is formed by crimping the side wall portion 332A inward in the lateral direction, a lateral force is transmitted to the sealing plate, and the sealing plate may be deformed. However, by having the gap C, it is possible to prevent the lateral force from being directly transmitted to the sealing plate, and the deformation of the sealing plate is suppressed.

Further, the portion of the first gasket 340 that comes into contact with the first surface S1 is compressed in the lateral direction by sealing between the side wall portion 332 and the opening edge portion 110 by caulking in the lateral direction. However, the thicker the thickness of the first gasket in the compression direction, the more the force applied during compression is dispersed, and the repulsive force of the gasket is likely to be reduced. The support wall 335A has a role of adjusting the thickness of the first gasket in the compression direction to a thickness at which a high repulsive force can be obtained, and enhancing the airtightness between the side wall portion 332A and the opening edge portion 110. .. The support wall 335A may be formed in an annular shape along the contour shape of the opening edge 110, but may be formed intermittently along the circumferential direction.

One end of the opening edge 110 is continuous with the accommodating portion 150. The other end 110T of the opening edge 110 is covered with a first gasket 340.

The first gasket 340 seals between the cap 330A and the opening edge 110. The first gasket 340 covers at least the inner peripheral surface of the opening edge portion 110, and is interposed between the tubular portion 120 (opening edge portion 110) and the top plate portion 331A in a compressed state. The outer diameter of the first gasket 340 may be larger than the inner diameter of the side wall portion 332 in the no-load state. In this case, the first gasket 340 can be brought into close contact with the cap 330A by press fitting.

The second gasket 350 seals between the cap 330A and the sealing plate 310. The second gasket 350 is a relay that connects the outer ring portion that covers the upper side of the peripheral edge portion 311 of the sealing plate 310, the inner ring portion that covers the lower portion of the peripheral edge portion 311 of the sealing plate 310, and the outer ring portion and the inner ring portion. It has a ring portion. The outer ring portion, the inner ring portion, and the relay ring portion of the second gasket 350 are integrated molded bodies. The second gasket 350 can be integrally molded with the sealing plate 310 by, for example, insert molding. By integral molding, a state in which the sealing plate 310 and the gasket 350 are in close contact with each other is easily achieved. Further, by integrally molding the sealing plate 310 and the gasket 350, the sealing plate 310 and the gasket 350 can be handled as one component, and the battery 10 can be easily manufactured.

The outer diameter of the second gasket 350 may be larger than the inner diameter of the support portion 334A in the no-load state. In this case, by press-fitting, the relay ring portion of the second gasket 350 is brought into close contact with the support portion 334A, and the space between the cap 330 and the sealing plate 310 can be sealed.

The opening edge portion 110 has a reduced diameter with respect to the accommodating portion 150, and the end portion 110T of the opening edge portion is bent toward the outside of the tubular portion 120. A second locking portion 402 is formed by this bent portion.

The second locking portion 402 is the first surface S1 which is the inner surface of the tubular portion 120, and the second inner surface of the tubular portion 120, which is bent from the first surface S1 and faces the top plate portion 331A. It has a surface S2 and. The first surface S1 and the second surface S2 are covered with a first gasket 340.

The portion of the first gasket 340 that is interposed between the first surface S1 and the support wall 335A is compressed in the lateral direction. Further, in the first gasket 340, a portion interposed between the second surface S2 and the top plate portion 331A can be compressed in the axial direction and the lateral direction. The repulsive force due to the compression of these gaskets 340 seals between the cap 330A and the opening edge 110. The first gasket 340 is also interposed between the tubular portion 120 (opening edge portion 110) and the side wall portion 332A. The second locking portion 402 locks the first locking portion 401 on the back surface of the first surface S1 via a first gasket 340 interposed between the opening edge portion 110 and the side wall portion 332A.

Below the portion of the first gasket 340 interposed between the opening edge 110 and the side wall 332A, the side wall 332A comes into contact with the cylinder 120 (opening edge 110) and extends along the cylinder 120. The side wall portion 332A is electrically connected to the tubular portion 120. In a part of the contact area between the side wall portion 332A and the tubular portion 120, the inner peripheral surface of the side wall portion 332A may be joined to the outer peripheral surface of the tubular portion 120 by welding. As a result, the sealing member 300A can be fixed to the tubular portion 120, and the reliability of the electrical connection between the cap 330A and the tubular portion 120 can be improved.

The inner peripheral surface of the side wall portion 332A of the cap 330A is overlapped with the outer peripheral surface of the tubular portion 120 on the opening edge portion 110 side. The inner diameter of the side wall portion 332A is equal to or less than the maximum value of the outer diameter of the portion of the tubular portion 120 (accommodating portion 150) that does not overlap with the inner peripheral surface of the side wall portion 332A. That is, the diameter of the tubular portion 120 (opening edge 110) that overlaps with the inner peripheral surface of the side wall portion 332A is reduced. As a result, the outer diameter of the side wall portion 332A of the cap 330A is made to be substantially the same as or less than the outer diameter of the accommodating portion 150, and the change in the diameter of the battery in the axial direction is reduced. In the present embodiment, although the diameter of the opening edge 110 is reduced, the diameter reduction can be started from a height close to the height of the surface 350S facing the electrode body of the second gasket 350. Therefore, as compared with the conventional configuration in which the reduced diameter portion is formed by grooving, the decrease in the arrangement space of the electrode body due to the reduced diameter is suppressed. Therefore, a battery having a high energy density can be realized. Further, it is also possible to set the region for reducing the diameter of the opening edge portion 110 to a region having a height higher than the facing surface 350S. In this case, the arrangement space of the electrode body is not restricted due to the reduced diameter of the opening edge portion 110.

The surface of the first gasket 340 in contact with the opening edge 110 may have a protruding portion (that is, a protruding surface) protruding in the radial direction of the tubular portion 120 in a no-load state. The protruding portion is compressed to some extent even when the cap 330A is fitted into the opening edge portion 110 of the cylinder portion 120 of the battery can 100, and a certain degree of airtightness is generated. Further, by caulking the side wall portion 332A of the cap 330A in the lateral direction, the compressibility of the protruding portion is remarkably increased, and the airtightness of the battery is further improved.

FIG. 4 shows a modified example of the battery 10. FIG. 4 is a schematic vertical cross-sectional view of the battery 11 according to the embodiment in which the vicinity of the opening edge 110 is enlarged. In the battery 11, the side wall portion 332A bends inward from the outer peripheral edge of the top plate portion 331A toward the bottom portion 130, and then does not extend along the outer peripheral surface of the tubular portion 120 (opening edge portion 110). Is in contact with a point (or line). In this case, the inner peripheral surface of the side wall portion 332A and the outer peripheral surface of the tubular portion 120 may be welded at the point contact position or the line contact position.

Further, in the battery 11, instead of bending the end 110T of the opening edge toward the outside of the cylinder 120, the thickness of the cylinder at the end 110T is increased to form a flange-shaped protrusion. There is. The second locking portion 402 is formed by this protruding portion. The upper end surface of the opening edge 110 constitutes the second surface S2. The second surface S2 is also one side surface of the protruding portion, and is substantially parallel to the surface facing the bottom portion of the top plate portion 331A. The second surface S2 faces the surface facing the bottom of the top plate portion 331A. A part of the first gasket 340 interposed between the first surface S1 and the support wall 335A is compressed in the lateral direction. A part of the first gasket 340 interposed between the second surface S2 and the top plate portion 331A can be compressed in the axial direction.

FIG. 5 shows another modification of the battery 10. FIG. 5 is a schematic vertical cross-sectional view of the battery 12 according to the embodiment in which the vicinity of the opening edge 110 is enlarged. In the battery 12, similarly to the battery 11, a flange-shaped protrusion portion is formed at the end portion 110T, and the second locking portion 402 is formed by the protrusion portion. Like the battery 11, the end face of the opening edge 110 constitutes the second surface S2. The second surface S2 is also one side surface of the protruding portion, and is substantially parallel to the surface facing the bottom portion of the top plate portion 331A. The second surface S2 faces the surface facing the bottom of the top plate portion 331A.

In the battery 12, the first gasket 340 covers the first surface S1 which is the inner peripheral surface of the tubular portion 120 (opening edge portion 110) and the second surface S2 which is the end surface of the opening edge portion 110, and is the first. It is interposed between the surface S1 and the support wall 335A and between the second surface S2 and the top plate portion 331A. A part of the first gasket 340 interposed between the first surface S1 and the support wall 335A is compressed in the lateral direction. A part of the first gasket 340 interposed between the second surface S2 and the top plate portion 331A can be compressed in the axial direction. On the other hand, the first gasket 340 is not interposed between the outer peripheral surface of the opening edge portion 110 and the side wall portion 332.

In the battery 12, the end portion of the side wall portion 332A has a protruding portion that is bent inward. The first locking portion 401 is formed by this protruding portion. The protruding portion of the side wall portion 332A constituting the first locking portion 401 is located below (bottom side) the protruding portion of the opening edge portion 110 forming the second locking portion 402, and the second locking portion is locked. It faces the protruding portion of the opening edge 110 constituting the portion 402.

More specifically, the side wall portion 332A is bent inward at the protruding portion of the first locking portion 401, so that the inner peripheral surface or the end surface of the first locking portion 401 is upward (top plate portion 331A side). ) Is facing. The surface of the protruding portion of the second locking portion 402 opposite to the second surface S2 faces downward. The surface facing upward of the side wall portion 332A (third surface S3) and the surface facing downward of the opening edge portion 110 (fourth surface S4) face each other, so that the first locking portion 401 and the second engaging portion 401 are engaged. The protruding portions of the stop portions 402 form hooks, and the cap 330A is locked to the tubular portion 120.

The battery 12 can be manufactured by crimping the side wall portion 332A inward in the lateral direction of the tubular portion while the cap 330A is pressed against the tubular portion 120 via the first gasket 340. As a result, in a state where the first gasket 340 is compressed in the axial direction, at least a part of the third surface comes into contact with the fourth surface, and the side wall portion 332 and the tubular portion 120 are electrically connected. Due to the repulsive force of the first gasket 340, the first locking portion 401 and the second locking portion 402 are brought into close contact with each other, and the electrical connection between the side wall portion 332A and the tubular portion 120 is maintained.

6A to 6C are cross-sectional views showing an example of the sealing process of the opening edge 110 in the battery 10, and the vicinity of the opening edge 110 is shown in an enlarged manner, respectively. For the batteries 11 and 12, the opening edge 110 can be sealed in the same process.

First, a sealing intermediate member is prepared in which the sealing plate 310 and the second gasket 350 are attached and the space between the cap 330A and the sealing plate 310 is sealed. The first gasket 340 is inserted into the sealing intermediate member between the side wall portion 332A of the cap 330A and the support wall 335A to obtain the sealing member 300A. However, in the sealing member in this state, as shown in FIG. 6A, the end portion 338 of the side wall portion 332A of the cap 330A extends outward.
Further, the diameter of the opening edge portion 110 is reduced, and the end portion of the reduced diameter opening edge portion 110 is bent outward to form the second locking portion 402.

Next, as shown in FIG. 6B, the sealing member 300A is overlapped with the opening edge portion 110 so that the second locking portion 402 fits into the gap of the first gasket 340.

Next, with the sealing member pressed against the opening edge 110, the side wall 332A is crimped in the lateral direction (diameter direction), and the outer peripheral surface of the second locking portion 402 is brought into close contact with the first gasket 340. At the same time, as shown in FIG. 6C, the end portion 338 of the side wall portion 332A is brought into contact with the opening edge portion 110.

(Second Embodiment)
FIG. 7 shows an embodiment of the battery according to the first aspect of the present disclosure, and is a schematic vertical cross-sectional view in which the vicinity of the opening edge 110 of the battery 13 is enlarged. Like the battery 10, the battery 13 shown in FIG. 7 has a cylindrical shape, and seals the cylindrical bottomed battery can 100, the cylindrical electrode body 200 housed in the can, and the opening of the battery can 100. It is provided with a sealing member 300A to be used.

In the battery 13, the opening edge portion 110 is a protrusion that is bent outward after being reduced in diameter and has an inner peripheral surface (second surface S2) facing the top plate portion 331A and extends outward. Has a part. The second locking portion 402 is formed by this protruding portion. Further, a protrusion protruding toward the first gasket is formed at the end of the protrusion portion. The first gasket 340 is axially compressed between the second surface S2 and the top plate portion 331A.

On the other hand, the end portion of the side wall portion 332A has a protruding portion that is bent inward. The first locking portion 401 is formed by this protruding portion. The end portion (first locking portion 401) of the side wall portion 332A projects inward so that the inner peripheral surface of the side wall portion 332A faces upward. The surface facing upward of the side wall portion 332A (third surface S3) and the outer surface of the protruding portion of the opening edge 110 which is the back surface of the second surface S2 (fourth surface S4) are in contact with each other, and the side wall portion 332A is formed. It is electrically connected to the cylinder portion 120.

The battery 13 can be manufactured by bending the end portion of the side wall portion 332A inward while the cap 330A is pressed against the tubular portion 120 via the first gasket 340. As a result, in a state where the first gasket 340 is compressed in the axial direction, at least a part of the third surface comes into contact with the fourth surface, and the side wall portion 332A and the tubular portion 120 are electrically connected. The repulsive force of the first gasket 340 maintains the electrical connection between the side wall portion 332A and the tubular portion 120.
Other configurations of the battery 13 are the same as those of the battery 10.

(Third Embodiment)
FIG. 8 shows an embodiment of the battery according to the first aspect of the present disclosure, and is a schematic vertical cross-sectional view in which the vicinity of the opening edge 110 of the battery 14 is enlarged. Like the battery 10, the battery 14 shown in FIG. 8 has a cylindrical shape, and seals the cylindrical bottomed battery can 100, the cylindrical electrode body 200 housed in the can, and the opening of the battery can 100. It is provided with a sealing member 300A to be used.

In the battery 14, the opening edge portion 110 has a reduced diameter, and a claw-shaped protruding portion protruding outward is formed at the end portion of the opening edge portion 110. The second locking portion 402 is formed by this protruding portion. In the protruding portion of the second locking portion 402, the protruding surface that protrudes outward facing the side wall portion 332A is inclined from a direction parallel to the axis so that the bottom side protrudes further outward.

On the other hand, a claw-shaped protrusion portion that protrudes inward is also formed at the end portion of the side wall portion 332A. The first locking portion 401 is formed by this protruding portion. In the protruding portion of the first locking portion 401, the protruding surface protruding inward in the lateral direction (diameter direction) is inclined from a direction parallel to the axis so that the bottom side protrudes more outward. As a result, as can be seen from FIG. 8, the first locking portion 401 and the second locking portion 402 form a hook in which one locks the other.

The second locking portion 402 has a first surface S1 which is an inner surface of the tubular portion 120, and a second surface S2 which is a side surface of the protruding portion and faces the top plate portion 331A. The first surface S1 and the second surface S2 are covered with a first gasket 340. The first gasket 340 is axially compressed between the second surface S2 and the top plate portion 331A.

The first locking portion 401 has a side surface (third surface S3) of a protruding portion facing the top plate portion 331A, and the second locking portion 402 has a side surface (fourth surface) of the protruding portion facing the bottom 130. It has S4). The third surface S3 and the fourth surface S4 are in contact with each other, and the side wall portion 332A and the tubular portion 120 are electrically connected.

The battery 14 can be manufactured by pressing the cap 330A forming the first locking portion 401 against the tubular portion 120 forming the second locking portion 402 via the first gasket 340. By pressing the cap until the third surface S3 of the first locking portion 401 is located below the fourth surface S4 of the second locking portion 402, the first gasket 340 is axially compressed. In this state, the first locking portion 401 and the second locking portion 402 are engaged, and the cap 330A is fixed to the tubular portion 120. At this time, at least a part of the third surface comes into contact with the fourth surface, and the side wall portion 332A and the tubular portion 120 are electrically connected. Due to the axial repulsive force of the first gasket 340, the first locking portion 401 and the second locking portion 402 are more firmly adhered to each other. As a result, the electrical connection between the side wall portion 332A and the tubular portion 120 is maintained. Further, this repulsive force becomes a fixing force for fixing the sealing member 300.

Other configurations of the battery 14 are the same as those of the battery 10.
In the batteries 13 and 14, the support wall 335A is not provided, and the outer peripheral wall of the support portion 334A is in contact with the first gasket 340. This configuration reduces wasted space between the first gasket 340 and the second gasket 350. Further, the support portion 334A can also serve as the function of the support wall 335A. However, in order to adjust the thickness of the first gasket, the support wall 335A may be provided on the outer peripheral side of the support portion 334A, and the first gasket 340 may be brought into contact with the outer peripheral wall of the support wall 335A.

(Fourth Embodiment)
FIG. 9 shows an embodiment according to the first aspect of the present disclosure, and is a schematic vertical cross-sectional view in which the vicinity of the opening edge 110 of the battery 15 is enlarged. Like the battery 10, the battery 15 shown in FIG. 9 has a cylindrical shape, and seals the cylindrical bottomed battery can 100, the cylindrical electrode body 200 housed in the can, and the opening of the battery can 100. It is provided with a sealing member 300A to be used.

In the battery 15, after the diameter of the opening edge portion 110 of the tubular portion 120 is reduced, the opening edge portion 110 bends diagonally toward the outside of the tubular portion 120 without extending in the axial direction, and toward the outside of the tubular portion 120. An extending protrusion is formed. The second locking portion 402 is formed by this protrusion.

The first gasket 340 is interposed between the inner peripheral surface S5 of the tubular portion 120 (opening edge portion 110), the top plate portion 331A, and the support wall 335A in the protrusion in the oblique direction, and covers the inner peripheral surface S5. .. In this case, the first gasket 340 exists in the vicinity of the inner peripheral surface S5 in a state of being compressed in an oblique direction which is the normal direction of the inner peripheral surface S5. In other words, the inner peripheral surface S5 also serves as both the first surface S1 and the second surface S1 in the battery 10, and the first gasket 340 is compressed in the lateral direction in the vicinity of the inner peripheral surface S5. Moreover, it can be said that it is compressed in the axial direction.

In the battery 15, the same effect as that of the battery 10 can be obtained while simplifying the step of bending the tubular portion 120 for forming the opening edge portion 110.
Other configurations of the battery 15 are the same as those of the battery 10.

FIG. 10 shows a modified example of the battery 15. FIG. 10 shows an embodiment of the battery according to the first aspect of the present disclosure, and is a schematic vertical cross-sectional view in which the vicinity of the opening edge 110 of the battery 16 is enlarged. In the battery 16, a part of the outer peripheral surface of the support wall 335A is inclined along the inner peripheral surface S5 of the protrusion portion constituting the second locking portion 402.

As described above, the first gasket 340 exists in a state of being compressed in the oblique direction in the vicinity of the inner peripheral surface S5. In the case of the battery 15 shown in FIG. 9, in the central portion of the inner peripheral surface S5, the thickness of the first gasket 340 in the compression direction (inner peripheral surface S5 and the top plate portion 331A) is compared with the position of the end portion of the protrusion. The distance between them) is thicker, and the compression ratio tends to be smaller. Therefore, the repulsive force of the first gasket 340 is not uniform depending on the position of the inner peripheral surface S5, and the repulsive force of the first gasket 340 is likely to be reduced.

However, by inclining the outer peripheral surface of the support wall 335A along the inner peripheral surface S5, the thickness of the first gasket 340 in the compression direction can be made uniform, the compressive force can be increased, and the region where the compressive force is high can be widened. can. As a result, the repulsive force of the first gasket 340 can be increased, and the sealing property between the opening edge 110 and the cap 330A can be enhanced.
Further, the inner peripheral surface of the support wall 335A may be inclined so that one end of the inclined surface is connected to the top plate portion. As a result, the support wall 335A is less likely to be deformed by a lateral force.
Other configurations of the battery 16 are the same as those of the battery 15.

In the above-described embodiment, the aspects of the sealing member 300A constituting the batteries 10 to 16, in particular, the aspects of the first locking portion 401 and the second locking portion 402 are exemplified. If necessary, the components of the sealing member 300A shown in each of the above embodiments can be arbitrarily combined.
In each of the above embodiments, the first gasket 340 and the second gasket 350 are separate members, but the support portion 334A and the support wall 335A are eliminated, and the first gasket 340 and the second gasket 350 are made continuous, and 1 It is also possible to seal between the opening edge 110 and the cap 330A and between the sealing plate 310 and the cap 330A by using one gasket.

(Fifth Embodiment)
FIG. 11 is a schematic vertical cross-sectional view showing an embodiment of the battery according to the first aspect of the present disclosure. The battery 17 shown in FIG. 11 is the battery 11 in which the sealing plate 310 and the second gasket 350 have different modes. The description of the first external lead wire 501 and the second external lead wire 502 is omitted.

The sealing plate 310 has a peripheral edge portion 311, a central region 312, and a thin wall portion 313. The thin-walled portion 313 is formed so as to be thinner from the central region 312 toward the peripheral edge portion 311 and to be the thinnest at the connection position with the peripheral edge portion 311. The outer surfaces of the peripheral portion 311, the central region 312, and the thin-walled portion 313 are substantially coplanar.

The peripheral edge portion 311 has an inner peripheral edge portion 311a arranged on the bottom 130 side (inside) and an outer peripheral edge portion 311b arranged on the opposite side (outside) of the bottom portion 130 and having an outer surface. The inner peripheral edge portion 311a and the outer peripheral edge portion 311b axially sandwich the second gasket 350 that covers the top plate portion 331A of the cap 330A. As a result, while insulating between the sealing plate 310 and the top plate portion 331A, the space between the sealing plate 310 and the top plate portion 331A is sealed.

The peripheral edge of the outer peripheral edge portion 311b has a protrusion protruding toward the bottom 130 side toward the second gasket 350. By pressing the second gasket 350 against this protrusion, a remarkably high sealing stress can be obtained. Similarly, a protrusion protruding toward the second gasket 350 may be formed on the edge of the through hole of the top plate portion 331A. In the example of FIG. 11, a protrusion located on the inner peripheral edge of the top plate portion 331A and facing the bottom portion 130 is provided with a protrusion protruding toward the bottom portion 130 toward the second gasket 350.

To fix the sealing plate 310 to the cap 330A, for example, the sealing plate 310 in a state where the inner peripheral edge portion 311a stands upright with respect to the central region 312 is inserted into the through hole of the top plate portion 331A together with the second gasket 350. Later, this can be done by caulking a portion of the upright inner peripheral edge 311a outward in the radial direction to form the inner peripheral edge 311a extending outward in the radial direction. At this time, the end portion of the second gasket 350 on the electrode body side may be bent when crimping to form the inner peripheral edge portion 311a and may be interposed between the inner peripheral edge portion 311a and the top plate portion 331A.

Other configurations of the battery 17 are the same as those of the battery 10.
In the batteries 11 to 16, the aspect of the sealing plate 310 and the second gasket 350 in the battery 17 and the sealing method between the sealing plate 310 and the top plate portion 331 may be applied.

[Second aspect]
The battery according to the second aspect of the present disclosure includes a battery can having a cylindrical cylinder portion and a bottom portion that closes one end of the cylinder portion, and an opening edge portion at the other end portion of the cylinder portion, and a cylinder. An electrode body housed in the portion, a sealing member fixed inside the opening edge portion so as to seal the opening of the opening edge portion, and a sealing agent arranged between the sealing member and the opening edge portion. To be equipped. The sealing member has a sealing plate electrically connected to one of the electrodes of the electrode body, and a cap connected to the sealing plate in an insulated state. The cap extends outward from the peripheral edge of the sealing plate in the radial direction of the cylinder, and separates from the ring-shaped top plate having through holes formed in the axial direction of the cylinder and from the bottom in the axial direction of the cylinder. A side wall portion that is erected on the peripheral edge of the top plate portion in the direction and faces the inner peripheral surface of the opening edge portion is provided. The sealing plate is arranged so as to close the through hole of the top plate portion. The battery can and cap are electrically connected to the other electrode of the electrode body. The sealant is arranged in a part between the side wall portion and the opening edge portion, and seals between the side wall portion and the opening edge portion.

(Sixth Embodiment)
FIG. 12 is a schematic vertical cross-sectional view showing an embodiment of the battery according to the second aspect of the present disclosure, and FIG. 13 is a perspective view of the battery. FIG. 14 is an enlarged view of region III of the battery 20 of FIG. Note that FIG. 12 is a schematic vertical sectional view of the upper side (sealing member side) of the battery 20 in FIG. 13.

The battery 20 includes a battery can 100, an electrode body 200 housed in the battery can 100, and a sealing member 300B for sealing the opening 110c of the battery can 100. The battery can 100 includes a cylindrical cylinder portion 120, a bottom portion 130 that closes the lower end portion of the cylinder portion 120, and an opening edge portion 110 provided at a predetermined portion on the upper end portion side (opening 110c side) of the cylinder portion 120. Has. The electrode body 200 is housed in the tubular portion 120 of the battery can 100. The sealing member 300B includes a sealing plate 310 electrically connected to one electrode of the electrode body 200 via an internal lead wire 210, and a cap 330B electrically connected to the other electrode of the electrode body 200 and the battery can 100. Has. An insulating gasket 320 (third gasket) is arranged between the sealing plate 310 and the cap 330B, whereby the insulation between the sealing plate 310 and the cap 330B is ensured. The sealing member 300B is fixed to the inside of the opening edge 110 so as to seal the opening 110c of the tubular portion 120. An insulating plate (upper insulating plate) 220 is arranged between the sealing member 300B and the electrode body 200.

The cap 330B of the sealing member 300B has a ring-shaped top plate portion 331B having a through hole 336 formed in the axial direction (or the thickness direction of the top plate portion 331B) and a side wall portion provided on the peripheral edge of the top plate portion 331B. It has 332B and. The sealing plate 310 is arranged so as to close the through hole 336 of the top plate portion 331B. The top plate portion 331B extends outward from the peripheral edge of the sealing plate 310 in the radial direction of the tubular portion 120. The side wall portion 332B is erected on the peripheral edge of the top plate portion 331B in the direction away from the bottom portion 130 of the battery can 100 (upward direction) in the axial direction of the tubular portion 120, and faces the inner peripheral surface of the opening edge portion 110. There is. In FIGS. 12 and 14, the top plate portion 331B includes a support portion 334B erected inside the side wall portion 332B in the radial direction. The support portion 334B may be formed integrally with the top plate portion 331B, or a body separate from the top plate portion 331B may be coupled to the top plate portion 331B. The support portion 334B is an annular wall portion and is bent inward in the radial direction of the tubular portion 120. A recess is formed in the top plate portion 331B by bending the support portion 334B, and the peripheral edge of the sealing plate 310 is accommodated in this recess. The upper surface of the bent portion of the support portion 334B is flat and is exposed from the opening 110c of the tubular portion 120. The support portion 334B does not have to be a perfect ring shape, and a plurality of support portions 334B may be arranged intermittently.

The shape of the top plate portion 331B is not limited to the above case, and it is sufficient that the sealing plate 310 can be held in a state of being insulated from the sealing plate 310. From the viewpoint of holding the peripheral edge of the sealing plate 310, the top plate portion 331B preferably has a recess, but is not limited to such a case. The support portion 334B is not limited to the case where it is erected above the top plate portion 331B as shown in FIGS. 12 and 14, and may be erected below the top plate portion 331B. However, from the viewpoint of reducing the volume occupied by the sealing member 300B, it is advantageous to erect the support portion 334B on the upper side.

The sealant 405 is arranged in a part between the side wall portion 332B of the cap 330B and the opening edge portion 110 (more specifically, the inner peripheral surface of the opening edge portion 110) of the battery can 100, and the side wall portion 332B is arranged. Is sealed between the opening edge 110 and the opening edge 110. In this way, by using the cap 330B and sealing the space between the cap 330B and the opening edge 110 with the sealing agent 405, the volume of the upper part of the electrode body 200 is reduced while ensuring the airtightness of the battery. can do. Therefore, in the battery 20, it is not necessary to provide an annular groove portion in the region between the end portion of the tubular portion 120 on the opening 110c side and the electrode body 200. Such an annular groove portion is usually formed so as to project inward in the radial direction from the outer peripheral surface side of the tubular portion 120.

Further, the outer diameter of the cap 330B is adjusted according to the inner diameter of the opening edge 110 so that the cap 330B can be fitted into the opening edge 110. When the airtight sealant 405 is applied to the outer peripheral surface of the side wall portion 332B of the cap 330B and / or the inner peripheral surface of the opening edge portion 110 and the sealing member 300B is inserted into the opening 110c of the tubular portion 120, the cap 330B is inserted. Is press-fitted, so that the airtightness can be further improved.

In FIGS. 12 and 14, the tubular portion 120 has a step portion 160 formed at an end portion (at the lower end portion) on the bottom portion 130 side of the opening edge portion 110. The step portion 160 is formed by making the thickness of the opening edge portion 110 smaller than the thickness of the portion of the tubular portion 120 other than the opening edge portion 110 (the portion below the opening edge portion 110). The cap 330B is arranged on the step portion 160. The step portion 160 prevents the cap 330B from being further inserted below the tubular portion 120. From the viewpoint of ensuring higher airtightness, when the tubular portion 120 has the step portion 160, it is preferable that the sealing agent 405 is also arranged between the step portion 160 and the cap 330B.

Further, in FIGS. 12 and 14, the side wall portion 332B is bent inward (inward in the radial direction) of the tubular portion 120 together with the opening edge portion 110 of the tubular portion 120. As a result, higher airtightness can be ensured and pressure resistance can be increased. Further, the reliability of the electrical connection between the opening edge portion 110 and the side wall portion 332B can be improved. The end portion of the tubular portion 120 on the opening edge 110 side and a portion in the vicinity thereof (and, if necessary, the upper end portion of the side wall portion 332B) may be bent inward in a flange shape. However, the present invention is not limited to these cases, and the upper end portion of the side wall portion 332B and the upper end portion of the opening edge portion 110 can be sealed between the side wall portion 332B and the opening edge portion 110 as long as the sealing between the side wall portion 332B and the opening edge portion 110 can be ensured. It does not necessarily have to be bent.

The battery 20 accommodates the electrode body 200 and the electrolyte in the tubular portion 120 of the battery can 100, and is one of the regions of the opening edge 110 of the battery can 100 and / or the cap 330B of the sealing member 300B, which face each other. It can be manufactured by applying the sealing agent 405 to the portion and inserting the sealing member 300B into the opening edge portion 110. The sealant 405 may be applied before the electrode body 200 and the electrolyte are housed in the battery can 100, or after the electrode body 200 and / or the electrolyte is housed. If necessary, the end portion of the opening edge portion 110 on the opening 110c side may be bent inward in the radial direction of the tubular portion 120 together with the side wall portion 332B of the cap 330B. When the sealant 405 needs to be cured, it may be cured at an appropriate stage after the sealant 405 is applied.

15A to 15C are schematic cross-sectional views on the opening edge 110 side for explaining the sealing of the battery can 100 using the sealing member 300B. 16A to 16C are enlarged views of main parts of FIGS. 15A to 15C, respectively.

Prior to inserting the sealing member 300B into the opening 110c of the tubular portion 120, the sealing agent 405 is applied to the region of the inner peripheral surface of the opening edge 110 of the tubular portion 120 on the electrode body 200 side and the upper surface of the step portion 160. (FIGS. 15A and 16A). In this state, the sealing member 300B is inserted into the opening 110c of the tubular portion 120 (FIGS. 15B and 16B). As a result, the sealant 405 is arranged between the side wall portion 332B of the cap 330B and the opening edge portion 110, and between the step portion 160 and the cap 330B. Then, the side wall portion 332B is bent inward in the radial direction of the tubular portion 120 together with the opening edge portion 110 (FIGS. 15C and 16C). Due to this bending, the pressure resistance can be increased, and the reliability of the electrical connection between the side wall portion and the opening edge portion can be enhanced.

As the sealing agent 405, for example, a known one used as a sealing agent for a battery can be used. The sealant 405 is preferably a material (coating material or the like) that has fluidity at room temperature (20 to 35 ° C.). However, after sealing the battery 20, the sealing agent 405 may be a solidified material having fluidity. The material having fluidity may contain a solvent (organic solvent or the like). Examples of the sealing agent 405 include polybutene, bron asphalt, straight asphalt, asphalt pitch, tar pitch, thermosetting resin, photocurable resin and the like. As the sealing agent 405, one type may be used alone, or two or more types may be used in combination. Further, the sealant 405 does not necessarily have to have an insulating property. For example, the above-mentioned material may contain conductive particles to form a conductive path between the side wall portion and the opening edge portion via the sealing agent 405.

The sealing agent 405 may be arranged in a part of the region where the cap 330B and the tubular portion 120 face each other. Of the regions where the cap 330B and the tubular portion 120 face each other, it is preferable that the cap 330B is arranged at the end portion on the electrode body side in the axial direction. Further, in the region where the cap 330B and the tubular portion 120 face each other, at least the outer peripheral surface of the side wall portion 332B and / or the inner peripheral surface of the tubular portion 120 may be arranged so as to cover in a ring shape having a predetermined width. From the viewpoint of ensuring the electrical connection between the cap 330B and the tubular portion 120, the predetermined width is preferably smaller than the height of the opening edge portion 110. When the tubular portion 120 has the stepped portion 160, it is preferable that the sealing agent 405 is arranged in at least a part of the region where the stepped portion 160 and the cap 330B face each other from the same viewpoint.

The thickness of the sealant 405 is, for example, 200 μm or less, and may be 100 μm or less. The thickness of the sealant 405 is, for example, 20 μm or more. The thickness of the sealant 405 can be measured from the X-ray photograph of the battery 1.

The other configuration of the battery 20 is not particularly limited, and the same configuration as that of the batteries 10 to 17 or a known one is used.
Similar to the battery 1 or the battery 17, a sealing plate 310 having a peripheral edge portion 311 and a central region 312 and a thin wall portion 313 may be used.

[Third aspect]
The battery according to the third aspect of the present disclosure includes a battery can having a cylinder portion having an opening edge at one end and a bottom portion closing the other end portion of the cylinder portion, and an electrode housed in the cylinder portion. It includes a body and a sealing member fixed to the battery can so as to seal the opening of the battery can. The sealing member extends between the sealing plate, the cap extending outward from the outer peripheral edge of the sealing plate and electrically insulated from the sealing plate, and between the inner peripheral surface of the cylinder and the sealing plate. It has a gasket to be sealed. The cap has a ring-shaped top plate that faces the opening edge in the axial direction of the cylinder, and a cylindrical cap that extends from the outer peripheral edge of the top plate toward the bottom and covers the outer peripheral surface of the tubular portion on the opening edge side. It has a side wall portion and. The side wall portion presses the cylinder portion and the gasket in the direction from the outer peripheral surface side to the inner peripheral surface side of the side wall portion and is electrically connected to the battery can, and the gasket is the inner circumference of the sealing plate and the tubular portion. It intervenes in a compressed state between the surface and the surface.

(7th Embodiment)
FIG. 17 is a schematic vertical cross-sectional view showing an embodiment of the battery according to the third aspect of the present disclosure, and FIG. 18 is a perspective view of the battery. FIG. 19 is a schematic vertical cross-sectional view of the battery 30 of FIG. 17 in which the vicinity of the opening edge 110 is enlarged.

The battery 30 has a cylindrical shape, and includes a cylindrical bottomed battery can 100, a cylindrical electrode body 200 housed in the can, and a sealing member 300C for sealing the opening of the battery can 100. ..

The battery can 100 has a tubular portion 120 for accommodating the electrode body 200 and a bottom portion 130. The tubular portion 120 has an opening edge at one end thereof, and the other end is closed by the bottom portion 130. The tubular portion 120 includes an accommodating portion 150 that accommodates the electrode body and a non-accommodating portion that does not accommodate the electrode body. At least a part of the non-accommodating portion constitutes the opening edge 110. The opening of the battery can 100 is closed by the sealing member 300C.

The sealing member 300C has a sealing plate 310, a gasket 320 (fourth gasket) arranged on the peripheral edge portion 311 of the sealing plate 310, and a cap 330C. The configuration of the sealing plate 310 is the same as that of the battery 10 in the first aspect.

The gasket 320 has an outer ring portion 321 and an inner ring portion 322, and a relay ring portion 323 connecting the outer ring portion 321 and the inner ring portion 322, and is between the inner peripheral surface of the tubular portion 120 and the sealing plate 310. Is sealed. The end surface 311T of the peripheral edge portion 311 of the sealing plate 310 is covered with the relay ring portion 323.

The outer ring portion 321 and the inner ring portion 322 and the relay ring portion 323 are integrated molded bodies. The gasket 320 can be integrally molded with the sealing plate 310 by, for example, insert molding. By integral molding, a state in which the sealing plate 310 and the gasket 320 are in close contact with each other is easily achieved. Further, by integrally molding the sealing plate 310 and the gasket 320, the sealing plate 310 and the gasket 320 can be handled as one component, and the battery 30 can be easily manufactured.

The cap 330C has a ring-shaped top plate portion 331C and a cylindrical side wall portion 332C. The cap 330C is electrically insulated from the sealing plate 310 by a gasket 320. The side wall portion 332C extends from the outer peripheral edge of the top plate portion 331C toward the bottom portion 130 and covers the outer peripheral surface of the opening edge portion 110 of the tubular portion 120.

The cap 330C is conductive and has the same polarity as the battery can 100. Therefore, the cap 330C can be provided with the other terminal function having a polarity different from that of the sealing plate 310. Therefore, both electrodes of the battery 30 can be collected from the upper surface of the sealing member 300C. For example, the first external lead wire 501 can be connected to the top plate portion 331C of the cap 330C, and the second external lead wire 502 can be connected to the outer surface of the central region 312 of the sealing plate 310.

The opening edge 110 has an open end and is continuous with the accommodating portion 150. The opening edge portion 110 is not in contact with the top plate portion 331C of the cap 330C, and there is a space between the end surface of the end portion 110T of the opening edge portion 110 and the inner surface of the top plate portion 331C. In this case, since the top plate portion 331C contacts only the gasket 320, it is easy to secure the flatness of the top plate portion 331C even when the cap 330C is pushed downward and mounted on the battery can. Therefore, it is easy to connect the first external lead wire 501 to the top plate portion 331C.

At least a part of the side wall portion 332C of the cap 330C presses the relay ring portion 323 of the gasket 320 against the end surface 311T of the peripheral edge portion 311 of the sealing plate 310 via the opening edge portion 110 to compress the relay ring portion 323. doing. As a result, the airtightness between the tubular portion 120 and the sealing member 300C is ensured. For example, the cap 330C presses the gasket 320 not in the axial direction of the tubular portion 120 of the battery can but in a direction perpendicular to the axial direction (also referred to as "diametrical direction" or "lateral direction"). In this case, when the force of the cap 330C pressing the gasket 320 is decomposed into the axial direction and the radial direction, the radial vector has a larger scalar amount than the axial vector.

On the inner peripheral surface of the side wall portion 332C of the cap 330C, a protrusion 333 protruding inward in the radial direction is provided along the circumferential direction. The protrusion 333 presses the side wall portion 332C of the cap 330C in the manufacturing process of the battery 10, for example, in a step of crimping the side wall portion 332C to the relay ring portion 323 of the gasket 320 via the opening edge portion 110. Can be formed by deformation of the side wall portion 332C. With the deformation of the side wall portion 332C, a protrusion 111 projecting inward in the radial direction may be formed along the circumferential direction at a position corresponding to the protrusion 333 on the inner peripheral surface of the tubular portion 120. The protrusion 333 presses the opening edge 110 against the end face 311T, and the protrusion 111 presses the relay ring portion 323 of the gasket 320 against the end face 311T.

The relay ring portion 323 of the gasket 320 may be provided with a recess 3231 in advance at a position corresponding to the protrusion 333 in the uncompressed state. By providing the recess 3231 in the gasket 320, it is possible to suppress excessive deformation of the gasket 320 when the relay ring portion 323 is compressed. However, the recess 3231 is not essential in the present invention, and from the viewpoint of increasing the amount of compression of the gasket 320 when the relay ring portion 323 is compressed and enhancing the airtightness between the sealing member 300C and the cylinder portion 120. , The recess 3231 may not be provided, or the depth of the recess 3231 may be formed shallow.

A plurality of protrusions 333 may be formed intermittently along the circumferential direction of the opening, or may be continuously formed along the circumferential direction of the opening. The continuously formed protrusions 333 may press the relay ring portion 323 of the gasket 320 more strongly toward the end surface 311T of the peripheral edge portion 311 of the sealing plate 310 via the opening edge portion 110. Therefore, the airtightness between the sealing plate 310 and the tubular portion 120 is more reliably ensured. When a plurality of protrusions 111 are intermittently formed, it is preferable to provide a plurality of (at least two, preferably four or more) protrusions 333 at positions angularly equivalent to the center of the opening.

In the height direction of the battery can 100, the position of the protrusion 333 and the center position of the end face 311T are substantially the same. As a result, deformation of the sealing plate 310 and the gasket 320 is suppressed. Further, the pressure applied to the gasket 320 or the relay ring portion 323 thereof is also less likely to be biased. Therefore, the deformation of the gasket 320 can be easily suppressed, the compressibility of the gasket 320 can be increased, and the airtightness between the sealing plate 310 and the tubular portion 120 can be more remarkably ensured.
Here, the position of the protrusion 333 and the center position of the end surface 311T of the sealing plate 310 are substantially the same as the position of the protrusion 111 and the end surface 111T of the sealing plate in the height direction of the battery can 100. This means that the amount of deviation from the center position is 4% or less of the height H of the battery can 100.

A concave groove 3111 is formed at the center position of the end surface 311T of the peripheral edge portion 311 of the sealing plate 310 so as to correspond to the protrusion 333 of the side wall portion 332C. In the height direction of the battery can 100, the amount of deviation between the center position of the concave groove 3111 and the position of the protrusion 333 may be 4% or less of the height H of the battery can 100.

The inner peripheral surface of the side wall portion 332C of the cap 330C is overlapped with and in contact with the outer peripheral surface of the tubular portion 120 on the side of the opening edge portion 110 of the tubular portion 120. The inner diameter of the side wall portion 332C is equal to or less than the maximum value of the outer diameter of the accommodating portion 150 that does not overlap the inner peripheral surface of the side wall portion 332C. That is, the diameter of the tubular portion 120 (opening edge 110) that overlaps the inner peripheral surface of the side wall portion 332C is reduced. As a result, the amount of protrusion of the outer diameter of the side wall portion 332C of the cap 330C with respect to the outer diameter of the accommodating portion 150 can be suppressed. The change in the diameter of the battery in the axial direction may be reduced so that the outer diameter of the side wall portion 332C of the cap 330C is substantially the same as or less than the outer diameter of the accommodating portion 150.

Under no load, the minimum inner diameter D ₃₃₂ of the side wall 332C (excluding the region where the protrusion 333 is formed) is the largest of the tubular portion 120 (opening edge 110) that overlaps the inner peripheral surface of the side wall 332C. It may be smaller than the outer diameter D _110. The battery can 100 can be press-fitted into the cap 330C with the opening closed by the sealing plate 310 and the gasket 320, and the cap 330C can be fixed to the battery can 100. From the viewpoint of fixability, the inner diameter D ₃₃₂ / outer diameter D ₁₁₀ may be 0.99 or less, or 0.98 or less. On the other hand, the inner diameter D ₃₃₂ / outer diameter D ₁₁₀ is preferably 0.9 or more because it is easy to press-fit.

In order to strengthen the connection between the cap 330C and the battery can 100, the cap 330C may be welded to the tubular portion 120. Preferably, the side wall portion 332C is welded to the cylinder portion 120 in at least a part of the region where the inner peripheral surface of the side wall portion 332C and the outer peripheral surface of the cylinder portion 120 on the opening edge side are overlapped.

FIG. 20 shows another aspect of the battery 30. FIG. 20 is a schematic vertical cross-sectional view of the battery 31 according to the third aspect of the present disclosure, in which the vicinity of the opening edge 110 is enlarged. In the battery 31, the space existing between the opening edge 110 and the inner surface of the top plate 331C in the battery 30 is filled with the gasket 320. Other than this, the configuration is the same as that of the battery 30.

The gasket 320 has an engaging portion 324 protruding outward from the relay ring portion 323 at the upper portion of the relay ring portion 323. The opening edge portion 110 faces the top plate portion 331C via the engaging portion 324. The engaging portion 324 has a role of positioning the gasket 320 on the opening edge portion 110. Further, at the time of sealing, the engaging portion 324 is compressed in the axial direction, so that the sealing between the sealing member 300C and the tubular portion 120 can be improved.

(8th Embodiment)
FIG. 21 shows an embodiment of the battery according to the third aspect of the present disclosure, and is a schematic vertical cross-sectional view in which the vicinity of the opening edge 110 is enlarged. Like the battery 30, the battery 32 shown in FIG. 21 has a cylindrical shape, and has a cylindrical bottomed battery can 100, a cylindrical electrode body 200 housed in the can, and an opening of the battery can 100. A sealing member 300C for sealing is provided.

In the battery 32, the inner diameter of the non-accommodating portion and the inner diameter of the accommodating portion 150 are smaller than the inner diameter of the non-accommodating portion and the inner diameter of the accommodating portion 150 between the accommodating portion 150 and the opening edge portion 110 of the battery can 100, and the bending that projects toward the inner peripheral surface side of the tubular portion 120. A portion (reduced diameter portion) 140 is provided. That is, the opening edge portion 110 is continuous with the accommodating portion 150 via the bent portion 140. The bent portion 140 has a first bent portion 140a whose inner diameter is continuously reduced from the accommodating portion 150, and a first bent portion 140a at a position where the inner diameter is continuously reduced from the opening edge portion 110 and the inner diameter is minimized. It is composed of a second bent portion 140b which is continuous with the above. One end of the opening edge 110 is continuous with the second bent 140b, and the other end of the opening edge 110 forms the opening edge.

The bent portion 140 has a role of supporting the gasket 320 on the electrode body side and fixing the positions of the sealing plate 310 and the gasket 320 when the opening of the battery can 100 is closed by the sealing plate 310 and the gasket 320 in the sealing step of the battery 32. Has. Further, although it depends on the degree of protrusion of the bent portion 140 toward the inner peripheral surface side, the inner ring portion 322 is compressed upward through the second bent portion 140b, and the outer ring portion 321 is compressed via the top plate portion 331C. Is compressed downward, so that the repulsive force of the gasket can be used to strengthen the sealing between the sealing plate 310 and the tubular portion 120.
Other configurations of the battery 32 are the same as those of the battery 30.

[Fourth aspect]
The battery according to the fourth aspect of the present disclosure includes a battery can having a tubular portion having an opening edge at one end and a bottom portion that closes the other end of the tubular portion, and an electrode body housed in the tubular portion. And a sealing member fixed to the opening edge so as to seal the opening of the opening edge. The sealing member includes a sealing plate, a cap extending outward from the outer peripheral edge of the sealing plate and electrically insulated from the sealing plate, and a gasket for sealing between the opening edge and the cap. , Have. The cap has a ring-shaped top plate that faces the opening edge in the axial direction of the cylinder, and a cylindrical cap that extends from the outer peripheral edge of the top plate toward the bottom and covers the outer peripheral surface of the tubular portion on the opening edge side. It has a side wall portion and. The gasket is interposed between the opening edge and the top plate portion, and the opening edge is axially pressed by the gasket.

(9th Embodiment)
FIG. 22 is a schematic vertical cross-sectional view showing an embodiment of the battery according to the fourth aspect of the present disclosure, and FIG. 23 is a perspective view of the battery. FIG. 24 is a schematic vertical cross-sectional view of the battery 40 of FIG. 22 in which the vicinity of the opening edge 110 is enlarged. The battery 40 has a cylindrical shape, and includes a cylindrical bottomed battery can 100, a cylindrical electrode body 200 housed in the can, and a sealing member 300D for sealing the opening of the battery can 100. ..

The battery can 100 has a tubular portion 120 for accommodating the electrode body 200 and a bottom portion 130. The tubular portion 120 has an opening edge at one end thereof, and the other end is closed by the bottom portion 130. The tubular portion 120 includes an accommodating portion 150 accommodating the electrode body and a non-accommodating portion not accommodating the electrode body provided on the opening edge side of the accommodating portion 150. At least a part of the non-accommodating portion constitutes the opening edge 110. The opening edge is closed by the sealing member 300D.

The sealing member 300D has a sealing plate 310, a gasket 320 (fifth gasket) arranged on the peripheral edge portion 311 of the sealing plate 310, and a cap 330D. The configuration of the sealing plate 310 is the same as that of the battery 10 in the first aspect.

The gasket 320 has an outer ring portion 321 and an inner ring portion 322, and a relay ring portion 323 connecting the outer ring portion 321 and the inner ring portion 322, and seals between the opening edge portion 110 and the sealing plate 310. doing. The end surface 311T of the peripheral edge portion 311 of the sealing plate 310 is covered with the relay ring portion 323.

The outer ring portion 321 and the inner ring portion 322 and the relay ring portion 323 are integrated molded bodies. The gasket 320 can be integrally molded with the sealing plate 310 by, for example, insert molding. By integral molding, a state in which the sealing plate 310 and the gasket 320 are in close contact with each other is easily achieved. Further, by integrally molding the sealing plate 310 and the gasket 320, the sealing plate 310 and the gasket 320 can be handled as one component, and the battery 40 can be easily manufactured.

The cap 330D has a ring-shaped top plate portion 331D and a cylindrical side wall portion 332D. The cap 330D is electrically insulated from the sealing plate 310 by a gasket 320. The side wall portion 332D extends from the outer peripheral edge of the top plate portion 331D toward the bottom portion 130, and covers the outer peripheral surface of the opening edge portion 110 of the tubular portion 120.

The cap 330D is conductive and has the same polarity as the battery can 100. Therefore, the cap 330D can be provided with the other terminal function having a polarity different from that of the sealing plate 310. Therefore, both electrodes of the battery 40 can be collected from the upper surface of the sealing member 300D. For example, the first external lead wire 501 can be connected to the top plate portion 331D of the cap 330D, and the second external lead wire 502 can be connected to the outer surface of the central region 312 of the sealing plate 310.

The opening edge portion 110 has an open end and is continuous with the accommodating portion 150 via a bent portion (diameter-reduced portion) 140. The end 110T of the opening edge 110 is covered with a gasket 320.

The diameter of the opening edge 110 is reduced with respect to the accommodating portion 150, and when the cap 330D fitted with the sealing plate 310 and the gasket 320 is overlapped with the cylinder 120, the end 110T of the opening edge 110 becomes the gasket 320. It overlaps with the inner ring portion 322 of. When the tubular portion 120 is pressed axially against the cap 330D in this state, a part of the opening edge portion 110 including the end portion 110T penetrates and fits into the gasket 320, and above the end portion 110T, The gasket 320 is compressed in the axial direction. As a result, the gasket 320 is interposed between the end portion 110T and the top plate portion 331D in a compressed state. Due to the repulsive force of the gasket due to this, the airtightness between the opening edge portion 110 and the top plate portion 331D is ensured. The gasket 320 is also interposed between the peripheral edge portion 311 of the sealing plate 310 and the top plate portion 331D, and seals between the sealing plate 310 and the cap 330D.

In order to facilitate the opening edge 110 to fit into the gasket 320 by pressing and to easily position the end 110T of the opening edge 110 with respect to the gasket 320 during pressing, the gasket 320 is in an uncompressed state. A recess may be formed at a position overlapping the end 110T of the inner ring portion 322 of the above.

The inner peripheral surface of the side wall portion 332D is joined to the outer peripheral surface of the tubular portion 120 by welding at the joining position P. As a result, the sealing member 300D is fixed to the tubular portion 120, and the electric connection between the cap 330D and the tubular portion 120 is achieved.

The inner peripheral surface of the side wall portion 332D of the cap 330D is overlapped with the outer peripheral surface of the tubular portion 120 on the opening edge portion 110 side. The inner diameter of the side wall portion 332D is equal to or less than the maximum value of the outer diameter of the portion of the tubular portion 120 (accommodating portion 150) that does not overlap with the inner peripheral surface of the side wall portion 332D. That is, the diameter of the tubular portion 120 (opening edge 110) that overlaps the inner peripheral surface of the side wall portion 332D is reduced. As a result, the amount of protrusion of the outer diameter of the side wall portion 332D of the cap 330D with respect to the outer diameter of the accommodating portion 150 can be suppressed. The change in the diameter of the battery in the axial direction may be reduced so that the outer diameter of the side wall portion 332D of the cap 330D is substantially the same as or less than the outer diameter of the accommodating portion 150. In the present embodiment, although the diameter of the opening edge portion 110 is reduced, the decrease in the arrangement space of the electrode body due to the diameter reduction is suppressed as compared with the conventional configuration in which the reduced diameter portion is formed by grooving. .. Therefore, a battery having a high energy density can be realized.

In the example of FIG. 22, the tubular portion 120 is bent in a crank shape from the accommodating portion 150 below the gasket 320 (on the electrode body side) to form a reduced diameter non-accommodating portion. The bent portion 140 can be provided close to the surface of the gasket 320 facing the electrode body (the outer surface 322S of the inner ring portion 322). Further, the tubular portion 120 may be bent above the outer surface 322S of the inner ring portion 322 to reduce the diameter of the non-accommodating portion. In this case, the thickness of the tubular portion sandwiched between the side wall portion 332D of the gasket 320 and the opening edge portion 110 is formed to be thin in the axial direction, and the axial width of the non-accommodating portion (opening edge portion 110 and bending portion 140) is formed. Keep short. In this case, the position of the bent portion 140 can be set within the gasket 320 in the axial direction of the tubular portion. That is, the bent portion 140 may be located between the outer surface 322S of the inner ring portion and the outer surface 321S of the outer ring portion in the axial direction of the tubular portion. In this case, the placement space of the electrode body is not restricted due to the reduced diameter of the non-accommodating portion.

Under no load, the minimum inner diameter D ₃₃₂ of the side wall 332D may be smaller than _{the maximum outer diameter D 110 of the} tubular portion 120 (opening edge 110) that overlaps the inner peripheral surface of the side wall 332. .. The battery can 100 can be press-fitted into the cap 330D with the opening closed by the sealing plate 310 and the gasket 320, and the cap 330D can be fixed to the battery can 100. From the viewpoint of fixability, the inner diameter D ₃₃₂ / outer diameter D ₁₁₀ may be 0.99 or less, or 0.98 or less. On the other hand, the inner diameter D ₃₃₂ / outer diameter D ₁₁₀ is preferably 0.9 or more because it is easy to press-fit.

(10th Embodiment)
FIG. 25 shows an embodiment of the battery according to the fourth aspect of the present disclosure, and is a schematic vertical cross-sectional view in which the vicinity of the opening edge 110 is enlarged. Like the battery 40, the battery 41 shown in FIG. 25 has a cylindrical shape, and has a cylindrical bottomed battery can 100, a cylindrical electrode body 200 housed in the can, and an opening of the battery can 100. A sealing member 300D for sealing is provided.

In the battery 41, the inner peripheral surface of the opening edge 110 and the end surface of the end 110T are covered with a gasket 320 (fifth gasket). On the other hand, the outer peripheral surface of the opening edge portion 110 is in contact with the side wall portion 332D of the cap 330D. As a result, the opening edge portion 110 and the side wall portion 332D are electrically connected, and the contact area is increased, so that the resistance is reduced.

Like the battery 40, the non-accommodating portion has a reduced diameter, and the inner diameter of the side wall portion 332D is equal to or less than the maximum value of the outer diameter of the accommodating portion 150 of the tubular portion 120. However, since the outer peripheral surface of the opening edge portion 110 is brought into contact with the side wall portion 332D, the degree of diameter reduction is less than that of the battery 40. Therefore, the diameter reduction process can be easily performed. Further, the position where the tubular portion 120 is bent from the accommodating portion 150 is set to a position close to the outer surface 322S facing the electrode body of the gasket 320 in the axial direction of the tubular portion, or set in the gasket 320. Is also easy.

Like the battery 40, the gasket 320 is interposed between the end 110T of the opening edge and the top plate 331D in a compressed state, and the opening edge 110 is capped in the compressed state of the gasket 320. It is inserted into the 330D, the opening edge 110 and the side wall 332D are joined, and the cap 330D is fixed to the battery can 100. The joint between the opening edge portion 110 and the side wall portion 332D is preferably joined by welding. By welding, the cap can be more firmly fixed to the battery can. The joining position P may be any region in which the outer peripheral surface of the tubular portion 120 and the inner peripheral surface of the side wall portion 332D are overlapped and in contact with each other.
Other configurations of the battery 41 are the same as those of the battery 40.

(11th Embodiment)
FIG. 26 is a schematic vertical cross-sectional view showing an embodiment of the battery according to the fourth aspect of the present disclosure. The battery 42 shown in FIG. 26 has a configuration in which the function of the gasket 320 that seals between the opening edge and the sealing plate is realized by using two separated gaskets in the battery 41. In the battery 12, the sealing member 300D has a gasket 340 (fifth gasket) and a gasket 350 (sixth gasket).

The gasket 340 seals between the cap 330D and the opening edge 110. The gasket 340 covers the inner peripheral surface of the opening edge portion 110 and the end surface of the end portion 110T, and is interposed between the end portion 110T and the top plate portion 331D in a compressed state. The outer diameter of the gasket 340 may be larger than the inner diameter of the side wall portion 332D in the no-load state. In this case, the gasket 340 can be brought into close contact with the cap 330D by press fitting.

The gasket 350 corresponds to the gasket 320 in the battery 41 shown in FIG. 25, and seals between the cap 330D and the sealing plate 310. Similar to the gasket 320 shown in FIG. 25, the gasket 350 includes an outer ring portion that covers the upper side of the peripheral edge portion 311 of the sealing plate 310, an inner ring portion that covers the lower portion of the peripheral edge portion 311 of the sealing plate 310, and an outer ring portion and the inner side. It has a relay ring portion that connects the ring portion. The sealing plate 310 and the gasket 350 are, for example, an integrated molded body. The gasket 350 can be integrally molded with the sealing plate 310 by, for example, insert molding.

The cap 330D has a support portion 334D. The support portion 334D stands upright from a position on the inner peripheral side of the top plate portion 331D from the position where the side wall portion 332D is formed, and extends axially toward the bottom portion 130. The support portion 334D fixes the gasket 350 to the cap 330 in a state where the space between the cap 330D and the sealing plate 310 is sealed. The contour line when the support portion 334D standing upright from the top plate portion 331D is viewed from the axial direction has a shape similar to that of the gasket 350. For example, when the battery is a cylindrical battery and the shape of the gasket 350 viewed from the axial direction is circular, the contour line of the support portion 334D is also circular. However, the contour line does not necessarily have to be a closed curve, and a region in which the support portion 334D is not provided may be provided in a part in the circumferential direction.

The outer diameter of the gasket 350 may be larger than the inner diameter of the support portion 334D in the no-load state. In this case, by press-fitting, the relay ring portion of the gasket 350D comes into close contact with the support portion 334, and the space between the cap 330 and the sealing plate 310 can be sealed.

In the example of FIG. 26, the support portion 334D extends axially toward the bottom 130, then further bends along the periphery of the gasket 350, and extends inward toward the central region 312 of the sealing plate 310. There is. Thereby, the sealing property between the cap 330D and the sealing plate 310 can be further improved. The bent portion of the support portion 334D can be formed by crimping a part of the upright support portion 334D to the inner peripheral side and bending the support portion 334D. The bent portion does not have to be formed on the entire circumference of the support portion 334D, and may be formed intermittently along the circumferential direction.

Other configurations of the battery 42 are the same as those of the battery 41.
In the battery 42, the same method as the battery 40 may be adopted as the sealing method between the cap 330D and the opening edge 110 by the gasket 340.

(12th Embodiment)
FIG. 27 is a schematic vertical cross-sectional view showing an embodiment of the battery according to the fourth aspect of the present disclosure. In the battery 43 shown in FIG. 27, the end portion of the cylinder portion 120 of the battery can 100 on the opening edge side extends in the direction toward the top plate portion 331D and then extends toward the bottom portion 130 to form a U shape. There is. That is, at the end portion on the opening edge side, the non-accommodating portion has a shape that bends or curves outward in the radial direction of the tubular portion 120 and then faces the bottom portion 130. A gasket 340 (fifth gasket) is interposed between the bent position or the portion extending from the bent position toward the bottom 130 and the top plate portion 331D of the cap 330D, and presses the end 110T of the opening edge 110. ing. A gasket 340 may also be interposed between the portion extending toward the bottom portion 130 and the side wall portion 332D of the cap 330D. In the battery 43, the U-shaped bent portion of the tubular portion 120 or the portion of the curved portion facing the top plate portion 331D is the end portion 110T of the opening edge portion.

Such a sealing structure of the opening edge 110 of the battery 43 can be manufactured, for example, by the following method.
(I) A sealing intermediate member is prepared in which the sealing plate 310 and the gasket 350 are attached and the space between the cap 330D and the sealing plate 310 is sealed. However, the sealing intermediate member is in a state in which the side wall portion of the cap 330D is not formed or the angle formed by the side wall portion and the top plate portion is obtuse.
(Ii) The non-accommodating portion (opening edge portion 110) of the tubular portion 120 is reduced in diameter, and the end portion of the reduced diameter tubular portion 120 is bent substantially parallel to the bottom portion 130 to form a surface substantially parallel to the bottom portion 130.
(Iii) At least a part of the gasket 340 is superposed on a surface substantially parallel to the formed bottom 130, and the gasket 340 is placed on the opening edge 110. Further, the sealing intermediate member is placed on the gasket 340 so that the gasket 340 is sandwiched between the top plate portion 331D and the opening edge portion 110.
(Iv) While pressing the opening edge 110 in the axial direction, the outer peripheral edge or side wall of the cap 330D is crimped together with the opening edge toward the bottom 130.

When forming a joint between the non-accommodating portion (opening edge portion 110) of the tubular portion 120 and the side wall portion 332D, the joint position P is the first portion toward the bottom 130 after being bent or curved outward in the radial direction. It may be on the side facing the bottom 130 from the region where the gasket 340 of the above is interposed.

For example, for a configuration in which the gasket 340 and the gasket 350 are not separated, such as the battery 40, it is possible to perform the same sealing as the battery 43.

In the battery of each of the above embodiments, the material of the battery can 100 is not particularly limited, and contains a small amount of iron and / or iron alloy (including stainless steel), copper, aluminum, aluminum alloy (manganese, copper and other metals). (Alloys, etc.), etc. can be exemplified. The material of the caps 330A, 330B, 330C, and 330D is not particularly limited, and the same material as the battery can 100 can be exemplified.

The materials of the gaskets 320, 340, and 350 are not limited, but for example, polypropylene (PP), polyphenylene sulfide (PPS), polyethylene (PE), polybutylene terephthalate (PBT), and perfluoroalkoxy alkane are examples of materials that can be easily integrally molded. (PFA), polytetrafluoroethylene (PTFE), polyamide (PA) and the like can be used.

Next, the configuration of the electrode body 200 will be exemplarily described by taking a lithium ion secondary battery as an example.
The cylindrical electrode body 200 is a winding type, and is configured by spirally winding a positive electrode and a negative electrode via a separator. An internal lead wire 210 is connected to one of the positive electrode and the negative electrode. The internal lead wire 210 is connected to the inner side surface of the central region 312 of the sealing plate 310 by welding or the like. Another lead wire is connected to the other of the positive electrode and the negative electrode, and the other lead wire is connected to the inner surface of the battery can 100 by welding or the like. Further, another insulating plate (lower insulating plate) may be provided between the electrode body 200 and the bottom portion 130. At this time, another lead wire may pass through a through hole formed in the other insulating plate, or may bypass the other insulating plate and connect to the inner surface of the battery can 100.

(Negative electrode)
The negative electrode has a band-shaped negative electrode current collector and negative electrode active material layers formed on both sides of the negative electrode current collector. A metal film, a metal foil, or the like is used for the negative electrode current collector. The material of the negative electrode current collector is preferably at least one selected from the group consisting of copper, nickel, titanium and alloys thereof and stainless steel. The thickness of the negative electrode current collector is preferably 5 to 30 μm, for example.

The negative electrode active material layer contains a negative electrode active material, and optionally contains a binder and a conductive agent. The negative electrode active material layer may be a deposited film formed by a vapor phase method (for example, thin film deposition). Examples of the negative electrode active material include Li metals, metals or alloys that electrochemically react with Li, carbon materials (for example, graphite), silicon alloys, silicon oxides, and metal oxides (for example, lithium titanate). The thickness of the negative electrode active material layer is preferably, for example, 1 to 300 μm.

(Positive electrode)
The positive electrode has a band-shaped positive electrode current collector and positive electrode active material layers formed on both sides of the positive electrode current collector. A metal film, a metal foil (stainless steel foil, aluminum foil, aluminum alloy foil) or the like is used for the positive electrode current collector.

The positive electrode active material layer contains a positive electrode active material and a binder, and optionally contains a conductive agent. The positive electrode active material is not particularly limited, but a lithium-containing composite oxide such as _{LiCoO 2} or LiNiO _{2 can be used.} The thickness of the positive electrode active material layer is preferably, for example, 1 to 300 μm.

Graphite, carbon black, or the like is used as the conductive agent contained in each active material layer. The amount of the conductive agent is, for example, 0 to 20 parts by mass per 100 parts by mass of the active material. Fluororesin, acrylic resin, rubber particles and the like are used as the binder contained in the active material layer. The amount of the binder is, for example, 0.5 to 15 parts by mass per 100 parts by mass of the active material.

(Separator)
As the separator, a resin-made microporous membrane or a non-woven fabric is preferably used. As the material (resin) of the separator, polyolefin, polyamide, polyamideimide and the like are preferable. The thickness of the separator is, for example, 8 to 30 μm.

(Electrolytes)
A non-aqueous solvent in which a lithium salt is dissolved can be used as the electrolyte. Examples of the lithium salt include LiClO _{4 , LiBF 4} , LiPF ₆ , LiCF ₃ SO ₃ , LiCF ₃ CO ₂ , and imide salts. Examples of the non-aqueous solvent include cyclic carbonates such as propylene carbonate, ethylene carbonate and butylene carbonate, chain carbonates such as diethyl carbonate, ethylmethyl carbonate and dimethyl carbonate, and cyclic carboxylic acid esters such as γ-butyrolactone and γ-valerolactone. And so on.

In the above description, the lithium ion secondary battery has been described as an example, but the present invention can be used in a battery that seals a battery can using a sealing body regardless of whether it is a primary battery or a secondary battery.

The battery according to the present invention can be used for various can-shaped batteries, and is suitable for use as a power source for, for example, portable devices, hybrid vehicles, electric vehicles, and the like.
Although the present invention has described preferred embodiments at this time, such disclosures should not be construed in a limited way. Various modifications and modifications will undoubtedly become apparent to those skilled in the art belonging to the present invention by reading the above disclosure. Therefore, the appended claims should be construed to include all modifications and modifications without departing from the true spirit and scope of the invention.

10 to 17, 20, 30 to 32, 40 to 43: Battery 100: Battery can 110c: Opening 120: Cylinder 110: Opening edge 110T: End 111: Protruding 140: Bending (diameter reduced)
150: Accommodating part 160: Step part 130: Bottom part 200: Electrode body 210: Internal lead wire 220: Upper insulating plate 300A, 300B, 300C, 300D: Sealing member 310: Sealing plate 311: Peripheral part 311a: Inner peripheral part 311b: Outer peripheral edge 311T: End face 3111: Recessed groove 312: Central area 313: Thin wall part 320: Gasket (third, fourth or fifth gasket)
321: Outer ring part 322: Inner ring part 323: Relay ring part 3231: Recessed part 324: Engagement part 330A, 330B, 330C, 330D: Cap 331A, 331B, 331C, 331D: Top plate part 332A, 332B, 332C, 332D : Side wall 333: Protrusion 338: End 334A, 334B, 334D: Support 335A: Support wall 336: Through hole 340: Gasket (first or fifth gasket)
350: Gasket (second or sixth gasket)
401: 1st locking portion 402: 2nd locking portion 405: Sealant 501: 1st external lead wire 502: 2nd external lead wire

Claims (35)

A battery can having a cylinder having an opening edge at one end and a bottom having a bottom that closes the other end of the cylinder, an electrode body housed in the cylinder, and an opening at the opening edge. It is provided with a sealing member fixed to the cylinder portion so as to be sealed.
The sealing member includes a sealing plate, a cap having a through hole corresponding to the sealing plate and connected to the sealing plate in a state of being electrically insulated from the sealing plate, and a cylinder portion and the cap. Has a sealing part that seals between
The axial direction is the direction in which both ends of the tubular portion face each other.
The cap has a ring-shaped top plate portion that faces the opening edge portion in the axial direction and is arranged along the peripheral edge of the sealing plate, and extends from the peripheral edge of the top plate portion toward the bottom portion. , A side wall portion that covers the outer peripheral surface of the tubular portion, and
The battery can is electrically connected to one of the electrodes of the electrode body.
The sealing plate is electrically connected to the other electrode of the electrode body.
The cap is a battery electrically connected to the cylinder portion. The battery according to claim 1, wherein the sealing portion has a first gasket interposed between the cap and the cylinder portion in a compressed state. The battery according to claim 2, wherein the sealing member further has a second gasket interposed between the sealing plate and the cap in a compressed state. The first gasket and the second gasket are provided apart from each other.
The battery according to claim 3, wherein a gap is provided between the first gasket and the second gasket. 3. The battery according to 4. The side wall portion has a first locking portion that is locked to the tubular portion.
The battery according to any one of claims 2 to 5, wherein a second locking portion for locking the first locking portion is provided on the opening edge portion. The second locking portion has a first surface which is an inner peripheral surface of the tubular portion and a second surface extending from the first surface and facing the top plate portion.
The first gasket covers at least a part of the first surface.
The battery according to claim 6, wherein at least a part of the first gasket covering the first surface is compressed in a direction perpendicular to the axial direction. The second locking portion has a first surface which is an inner peripheral surface of the tubular portion and a second surface extending from the first surface and facing the top plate portion.
The first gasket covers at least a part of the second surface.
The battery according to claim 6, wherein at least a part of the first gasket covering the second surface is compressed in the axial direction. The first gasket is interposed between the tubular portion and the side wall portion.
Any one of claims 6 to 8, wherein the second locking portion locks the first locking portion via the first gasket interposed between the tubular portion and the side wall portion. Batteries described in the section. The battery according to claim 9, wherein the side wall portion is below the portion of the first gasket that is interposed between the cylinder portion and the side wall portion and is electrically connected to the cylinder portion. .. The second locking portion has a protruding portion that projects outward of the tubular portion and / or bends or curves outward of the tubular portion.
The battery according to any one of claims 6 to 10, wherein the first gasket is interposed between at least a part of the protruding portion and the cap in a compressed state. The first locking portion has a protruding portion that projects inward of the side wall and / or bends or curves inside the side wall.
The protruding portion of the first locking portion is located closer to the electrode body than the protruding portion of the second locking portion, and faces the protruding portion of the second locking portion, so that the cap The battery according to claim 11, wherein the battery is locked. At least a part of the protruding portion of the first locking portion facing the protruding portion of the second locking portion abuts on the second locking portion and electrically with the second locking portion. The battery according to claim 12, which is connected. The second locking portion has a protrusion that bends or curves and extends outward of the tubular portion.
The cap has an annular support wall erected on a surface of the top plate portion facing the bottom portion.
Any one of claims 6 to 13, wherein the outer peripheral surface of the support wall is inclined along the protrusion of the second locking portion and is in contact with the inner peripheral surface of the first gasket. Batteries described in the section. The cap has an annular support wall erected on a surface of the top plate portion facing the bottom portion.
The battery according to any one of claims 2 to 13, wherein the outer peripheral surface of the support wall is in contact with the inner peripheral surface of the first gasket. The sealing portion has a sealing agent disposed between the sealing member and the opening edge portion.
The battery according to claim 1, wherein the sealing agent is arranged in a part between the side wall portion and the opening edge portion, and seals between the side wall portion and the opening edge portion. The battery according to claim 16, wherein the side wall portion is bent inward in the radial direction of the tubular portion together with the opening edge portion of the tubular portion. The top plate portion includes a recess for accommodating the peripheral edge of the sealing plate.
The battery according to claim 16 or 17, wherein an insulating third gasket is arranged between the recess and the sealing plate. The top plate portion includes a support portion that is erected inward from the side wall portion and is bent inward in the radial direction of the tubular portion.
The battery according to claim 18, wherein the recess is formed by bending the support portion. The tubular portion is provided with a step portion formed at the bottom end side of the opening edge portion inside the tubular portion by making the thickness of the opening edge portion smaller than that of the remaining portion.
The cap is placed on the step and
The battery according to any one of claims 16 to 19, wherein the sealing agent is further arranged between the step portion and the cap. The sealing member further includes a fourth gasket that seals between the inner peripheral surface of the tubular portion and the sealing plate.
The sealing portion is provided on a part of the side wall portion, and the sealing portion is provided.
The sealing portion presses the tubular portion and the fourth gasket in a direction from the outer peripheral surface side to the inner peripheral surface side of the side wall portion, and electrically connects the side wall portion and the battery can. The battery according to claim 1, wherein the fourth gasket is interposed between the sealing plate and the inner peripheral surface of the cylinder portion in a compressed state. The outer peripheral surface of the tubular portion on the opening edge side is overlapped with the inner peripheral surface of the side wall portion.
A protrusion protruding inward is provided on the inner peripheral surface side of the side wall portion.
The battery according to claim 21, wherein the fourth gasket is compressed in a direction from the outer peripheral surface side to the inner peripheral surface side of the side wall portion by the protrusion. The battery according to claim 21 or 22, wherein the inner surface of the top plate portion abuts on the fourth gasket and does not abut on the opening edge portion. The battery according to any one of claims 21 to 23, wherein the tubular portion has a support portion that projects toward the inner peripheral surface side of the tubular portion and supports the electrode body side of the fourth gasket. The battery according to any one of claims 21 to 24, wherein the sealing plate and the fourth gasket are joined to each other. The sealing portion has a fifth gasket that seals between the opening edge portion and the cap.
The fifth aspect of the invention, wherein the fifth gasket is interposed between the opening edge portion and the top plate portion, and the opening edge portion is pressed in the axial direction by the fifth gasket. Batteries. The sealing member further comprises a sixth gasket that seals between the sealing plate and the cap.
The battery according to claim 26, wherein the sixth gasket is provided apart from the fifth gasket. The cap has a support portion extending in the axial direction toward the bottom portion on the inner peripheral side from a position where the side wall portion of the top plate portion is formed.
The sixth gasket is interposed between the inner peripheral surface of the support portion and at least the outer peripheral edge portion of the sealing plate.
The battery according to claim 27, wherein the fifth gasket is located on the outer peripheral side of the support portion and is provided in an outer peripheral region including the outer peripheral end portion of the top plate portion. The battery according to claim 26, wherein the fifth gasket is also interposed between the outer peripheral edge portion of the sealing plate and the top plate portion to seal between the sealing plate and the cap. The end portion of the tubular portion on the opening edge side has a shape that bends or curves outward in the radial direction of the tubular portion and then extends toward the bottom portion.
The battery according to any one of claims 26 to 29, wherein the fifth gasket is interposed between a portion extending from a bent position or a bent position toward the bottom portion in the shape and the top plate portion. .. The battery according to claim 30, wherein in the above shape, the outer peripheral surface of the tubular portion and the inner peripheral surface of the side wall portion are joined on the side toward the bottom of the region where the fifth gasket is interposed. .. The inner peripheral surface of the side wall portion is overlapped with the outer peripheral surface of the tubular portion on the opening edge side.
The outer diameter of the overlapping region overlapped with the inner peripheral surface of the side wall portion of the tubular portion is smaller than the outer diameter of the tubular portion excluding the overlapping region.
The battery according to any one of claims 1 to 31, wherein the inner diameter of the side wall portion is equal to or less than the maximum value of the outer diameter of the tubular portion. The battery according to any one of claims 1 to 22, wherein the inner peripheral surface of the side wall portion is joined to the outer peripheral surface of the tubular portion. The lower surface of the sealing plate facing the bottom is on the same surface as the surface of the top plate that does not face the bottom, or is closer to the bottom than the surface of the top plate that does not face the bottom. The battery according to any one of claims 1 to 33. The battery according to any one of claims 1 to 34, wherein the tubular portion is a cylinder.

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